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Applications

Water/heat differential

(Heating/cooling)

Application areas

Calculation of the heat quantity, which is transmitted to or from a heat exchanger in a water
circuit. Typical application for energy measurement in a heating or cooling network

.

Measurements

Measurement of operating volume and temperature in a water circuit immediately before and
after a heat exchanger (in the inflow and return circuit).
A pressure sensor can also be connected in order to measure the operational pressure in the
circuit. This pressure measurement has no direct influence on the actual calculation (see inputs).

Inputs

•

Inflow: Flow (q), temperature (T

1

)

•

Return: Temperature (T

2

)

Note!

- For an exact calculation of the process values and measurement range limits, a further input value for the
operating pressure of the water network is required. The average operating pressure (p) is a preset value (not an
input signal). The pressure can only be entered as an average signal, even if the pressure is measured using a
pressure sensor.
- The flow meter installation point is selectable!
- The installation point is defined as the warm/cold side and not the inflow/return, as this definition is clear for
all operating modes.
- It is recommended to place the flow meter in a position in the circuit where the temperature is closest to the
ambient (room) temperature.

Calculated values

Calculation of mass flow, heat differential (heat flow or power), temperature difference, Enthalpy
difference, density (IAPWS–IF97 Standard).

Output values/display at unit

•

Heat flow, mass flow, flow (operating volume), temperature 1, temperature 2, temperature

difference, Enthalpy difference, density.

•

Heat quantity sum, mass sum, flow sum.

Outputs

All output values can be transmitted using the output terminals, this means both unchanged
inputs as well as calculated values. Please note that the number of outputs available is dependent
on the unit type.

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Содержание RMS621

Страница 1: ...BA127R 09 en 08 04 510 04788 Software Version 2 0 Operating manual RMS 621 Energy manager ...

Страница 2: ...A10 and connect DP transmitter to terminals A10 82 because of passive signal Set up start and end value in mbar Tube data enter internal tube diameter and diameter ratio ß as found on the maufacturers data sheet Caution If tube data is not known for flow meter operating volume Curve linear set up square rooted curve on the DP transmitter Set up start and end values einstellen m3 h 5 Pressure input...

Страница 3: ...led display scroll using the arrow under group 6 If a fault occurs the display automatically changes colour blue red Detailed fault finding and elimination can be found in the relative chapter of these operating instructions Example 2 Liquid heat difference Sensors 2 x TST90 Promag 50 1 Connect device to the power source terminal L L 220 V 2 Press any key Menu Setup all parameters 3 Basic set up D...

Страница 4: ...n can be found in the relative chapter of these operating instructions An example of steam mass measurement using a Prowirl 77 can be found in the appendix of this operating manual Application basic set up The values shown are only an indication in order to simplify the commissioning of the device this means that only the most necessary settings are shown Special functions e g tables corrections e...

Страница 5: ...ement sensor warm cold Allocate temperature sensors Flow Pulse PFM e g ProWirl Analogue e g Promag Differential pressure e g Orifice Flow Pulse PFM e g Prowirl Analogue e g Prowirl Differential pressure e g Orifice Flow input Flow input Flow input Flow meter Operating volume Flow meter Operating volume Differential pressure Orifice Gas Terminals Flow meter with active signal connect to e g termina...

Страница 6: ...RMS 621 6 Endress Hauser ...

Страница 7: ...ng measurement sensors 14 4 3 Connection control 22 5 Operation 22 5 1 Operation at a glance 22 5 2 Human interface 24 5 4 Error message display 27 5 5 Communication 28 6 Commissioning 29 6 1 Installation control 29 6 2 Switch unit on 29 6 3 Quick Set up 30 6 4 Unit set up 30 6 5 Customer specific applications 50 7 Maintenance 51 8 Accessories 51 9 Fault finding 51 9 1 Troubleshooting instructions...

Страница 8: ... only be used in an appropriately installed condition 1 2 Installation commissioning and operation The unit is safely manufactured using state of the art technology and complies with the respective EU regulations The unit could be dangerous if it is incorrectly installed or used Mechanical and electrical installation commissioning and maintenance of the unit must only be carried out by skilled and...

Страница 9: ...quences that if done incorrectly could lead to personal injury or faulty operation or complete damage to the unit Warning This pictogram refers activities or sequences that if done incorrectly could lead to personal injury a safety risk or total damage to the unit Note This pictogram refers activities or sequences that if done incorrectly could have a direct influence on the units operation or cou...

Страница 10: ...n The unit complies with the EN 61010 regulations Safety requirements for electrical measurement control and laboratory instrumentation This means that the unit described in this installation and operating manual fulfils the requirements demanded by the EU regulations The manufacturer acknowledges successful unit testing by adding the CE mark The unit was developed in accordance with the OIML R75 ...

Страница 11: ... installation depth For further dimensions please see Chap 10 Technical data 3 1 2 Installation area Installation inside a control panel on top hat DIN rail according to EN 50 022 35 The installation area must be free of vibration 3 1 3 Installation orientation No limitation 3 2 Installation First remove the keyed plug on terminals from the housing Snap the housing onto the DIN rail by first hooki...

Страница 12: ...xpansion card is only correctly fitted when the holding clips on the lower and rear sides of the unit have clicked into place see Fig 5 Pos 1 and 2 Make sure that the input terminals of the expansion card are at the top and the analogue connection terminals to the base unit are facing the front 4 The new expansion card is automatically recognised by the unit once it has been correctly connected an...

Страница 13: ...10 0 4 to 20 mA PFM pulse input 1 11 Signal ground for 0 4 to 20 mA PFM pulse input 83 24 V sensor supply 2 A top back A II Current PFM pulse input 2 81 Sensor supply ground 2 110 0 4 to 20 mA PFM pulse input 2 11 Signal ground for 0 4 to 20 mA PFM pulse input 1 RTD supply 1 E top front E I RTD input 1 5 RTD sensor 1 6 RTD sensor 1 2 RTD supply1 3 RTD supply 2 E top back E II RTD input 2 7 RTD sen...

Страница 14: ...ge of parts of the electronics 131 0 4 to 20 mA pulse output 1 E bottom back E IV Current pulse output 1 132 0 4 to 20 mA pulse output 1 133 0 4 to 20 mA pulse output 2 Current pulse output 2 134 0 4 to 20 mA pulse output 2 52 Relay common COM A bottom front A III Relay 53 Relay normally open NO 92 24 V sensor supply Additional sensor supply 91 Supply ground L L L for AC L for DC A bottom back A I...

Страница 15: ...ensors can be connected to the unit Dependent on the signal type the terminals can be freely selected This means that the energy manager is very flexible in its application and the terminals are not bound to any particular sensor type e g flow sensor terminal 11 pressure sensor terminal 12 etc If the unit is to be used as a heat counter according to the OIML R 75 then the connection regulations co...

Страница 16: ...a passive sensor e g optional universal expansion card Slot B I Fig 13 Temperature sensors Connection for Pt100 Pt500 and Pt1000 Note Terminals 1 and 5 3 and 7 must be linked when using 3 wire sensors see Fig 10 Fig 10 Connection of temperature sensors e g to input 1 Slot EI Pos 1 4 wire input Pos 2 3 wire input Pos 3 3 wire input e g optional temperature expansion card Slot B I Fig 13 E H specifi...

Страница 17: ...ow sensors with an active current output 4 to 20 mA Flow sensors with an active current output and an pas sive frequency output measurement of bi directional flow Note Select the relative resistance R so that Imax does not exceed 20 mA Terminals 82 110 Direction signal Terminals 10 11 Flow signal Temperature sensor using an temperature head transmitter 4 to 20 mA Pressure sensors with a passive cu...

Страница 18: ...nnections Pos 1 Pulse and current outputs active Pos 2 Passive pulse output Open Collector Pos 3 Relay output normally open e g Slot A III Slot BIII CIII DIII on optional expansion card Pos 4 Loop power supply output Interface connection RS232 connection The RS232 interface is connected using the interface cable delivered with the unit and the jack plug socket on the front of the unit RS485 connec...

Страница 19: ...t PFM pulse input 2 181 Ground power supply 2 113 0 4 to 20 mA PFM pulse input 1 111 Signal ground for 0 4 to 20 mA PFM pulse input 142 Relay 1 Common COM B C D bottom front B III C III D III Relay1 143 Relay 1 normally open NO 152 Relay 2 Common COM Relay 2 153 Relay 2 normally open NO 131 0 4 to 20 mA pulse output 1 B C D bottom middle B IV C IV D IV Current pulse output 1 active 132 0 4 to 20 m...

Страница 20: ... one without a display operating module In order to connect the remote display a four core cable is supplied other components are not required Note Only one remote display operating unit can be connected to a DIN rail mounted unit and Vica Versa point to point Terminal Pos no Terminal layout Slot In and outputs 117 RTD supply 1 B C D top front B I C I D I RTD input 1 116 RTD sensor 1 115 RTD senso...

Страница 21: ...as been prepared in the panel front installation depth is 45 mm 2 Push the unit through the panel cutout from the front making sure that the gasket is in place 3 Hold the unit flat and using even pressure push the housing fixing frame over the rear of the unit up to the panel until the fixing clips altch into place Make sure that the unit sits symmetrically in the fixing frame Fig 14 Panel mountin...

Страница 22: ...ssistance a help text is available for most operating addresses These can be activated by operating the key The help text can be called upon for each menu 5 1 1 Main menu Fig 16 Main menu Unit condition and specifications Hint Is the unit or cables visibly damaged visual control Electrical connection Hint Does the power supply used correspond with that printed on the unit legend plate 90 to 250 V ...

Страница 23: ...RMS 621 5 Operation Endress Hauser 23 5 1 2 Display Quick Setup ...

Страница 24: ...he measured values alarm set points and fault messages The rear illumination can be set up to change from blue to red in a fault condition The displayed character size is dependent on the number of parameters to be displayed see chap 6 4 3 Display set up Pos 5 Entry keys Eight soft keys the function of each key changes depending on the menu address The actual functionality of the key is always ind...

Страница 25: ...ledgement of preset values Z Leaves the active editing mask or active menu address without saving any changes made Ç Moves the cursor one line or character upwards È Moves the cursor one line or character downwards Æ Moves the cursor one character to the right Å Moves the cursor one character to the left If a help text is available for the active operating address this is indicated using a questio...

Страница 26: ...lower case or numbers Fig 19 picture 2 4 Using the arrow keys select the required character and acknowledge with the tick key If the text is to be deleted select the upper right hand key Fig 19 picture 2 5 Edit other characters in the same way until the required text is complete 6 In order to change from the editor mode to display mode operate the Esc key and acknowledge the changes using the tick...

Страница 27: ...if any error must be acknowledged before the unit returns to its operating mode Setup Alarm limit set point Event text GW Ack see chap 6 4 3 If more than one system or process errors are active then these are displayed in chronological order and the error displayed is always the oldest error System error messages There is always a rear illumination colour change reaction from blue to red and an er...

Страница 28: ...ce the ReadWin 2000 PC software and a serial interface cable see Chap 8 Accessories This is recommended if very complicated applications need to be set up e g on initial commissioning Note For detailed information to how to set up the unit using the ReadWin 2000 PC operating software can be found in the operating manual found on the data carrier ...

Страница 29: ...ions Alternatively this can be set up at a later time 6 2 3 Remote display operating module The remote display operating module is normally configured at the factory Unit address 01 Baudrate 56 7k RS485 master The display automatically sets up communication with the base unit after the power supply has been switched on and a short initialisation time Please make sure that the unit address of the b...

Страница 30: ...individual groups with process values can be selected to appear in the display It is also possible to call on the event memory where the error protocol and other diverse unit information can be seen The contents of individual groups and the display function can only be defined in Set up Display A group can contain a maximum of eight process values that can be viewed in one window on the display Wh...

Страница 31: ...such as unit identifier date and time Application inputs All important parameters for the application to be calculated are to be found in this sub menu Outputs Active and passive analogue and pulse outputs as well as relays are set up in this sub menu End Exit Quick Setup Quick Set up Set up in individual steps 1 First check the unit set up and select an application Menu Applications Inputs 2 The ...

Страница 32: ... the display A further group with preset parameters can be called up using Display Group Note Please note the use of the double arrow function in the Quick Setup Access to the next window in the operating structure is done using the double arrow right To return the previous window use the double arrow left Note In the Quick Setup the inputs are automatically allocated free connection terminals Ple...

Страница 33: ...TAG number Allocation of a TAG number e g as seen on circuit diagrams max 12 characters Date DD MM YY Actual set up date country dependent Note Important for daylight saving time set up TIme HH MM Actual set up time for the unit s real time clock Text input Standard Palm Selection of text entry mode Standard Each parameter character is scrolled from the available character set until the required c...

Страница 34: ... take note of the hints in the appendix Flow measurement set up Differential pressure device Pitot Orifice corner tap Orifice D tap Orifice end tap ISA 1932 nozzle Long radius nozzle Venturi tube Venturi pipe cast iron Venturi pipe machined Venturi pipe sheet metal Construction of the differential pressure sensor Note Wehen using Pitot tubes a correction factor must be entered see appendix 11 2 1 ...

Страница 35: ...ifferential pressure at 0 or 4 mA Note Only selectable for the 0 4 to 20 mA signal End value 0 0000 to 999999 End value for the flow differential pressure value at 20 mA Note Only selectable for the 0 4 to 20 mA signal Offset 9999 99 to 9999 99 Moves the zero point on the sensor curve this function helps by fine adjustment of the sensor Note Only selectable for the 0 4 to 20 mA signal Flow Cut off...

Страница 36: ...nt range change over for differential pressure devices Note Only selectable for differential pressure measurements For details see Splitting range in the appendix Term range 1 A 10 A 110 B 112 B 113 C 112 C 113 D 112 D 113 Terminals for connection to the differential pressure range with the smallest measurement range Term range 2 A 10 A 110 B 112 B 113 C 112 C 113 D 112 D 113 Terminals for connect...

Страница 37: ...ure measured is in absolute or relative pressure over pressure units If relative pressure is selected then atmospheric pressure must also be entered in this section Format 9 9 9 9 99 9 9 9999 Number of decimal points Signal damping 0 to 99 s Time constant of a 1st order low pass filter for the input signal This function is used to avoid display fluctuations on high fluctuating input signals Note O...

Страница 38: ... possible Note Terminal identifier X 1X e g A 11 describes a current input the identifier X 2X e g E 21 indicates a pure temperature input The type of input is dependent on the extension cards Engineering Units C K F Engineering units of the temperature measurement Format 9 9 9 9 99 9 999 Number of decimal points Signal damping 0 to 99 s 0 s Time constant of a 1st order low pass filter for the inp...

Страница 39: ...t steam applications Q T Flow and temperature Q P Flow and pressure Only two input signals are required when measuring saturated steam the missing value will be automatically calculated by the unit using the built in saturated steam curve only on steam type saturated steam Input signals for flow pressure and temperature are required for measuring superheated steam Note Only on saturated steam appl...

Страница 40: ...e are available Note Set up not active for differential applications Temperature cold Please select Temperature 1 6 Allocation of the sensor that measures the lowest temperatures in the application Only the sensors that have already been set up see Setup Temperature are available Note Set up only active for heat differential measurement applications Temperature warm Not used Temperature 1 6 Alloca...

Страница 41: ...e Gbtu time ton refrigeration Defines the heat quantity per preset time unit or the thermal power Heat sum kW time MW time kcal Gcal GJ KBtu Mbtu Gbtu ton time MJ kJ Engineering unit for the heat quantity or thermal energy Mass flow g time t time ibs time tons US time tons time kg time Engineering unit for the mass flow per previously defined time unit Mass sum g T ibs tons US tons kg Engineering ...

Страница 42: ...rocess values is dependent on the number of values in each group Display set up can be found in the menu Setup all parameters Æ Display Note Selection of which group containing process values is to be indicated in the display is done in Main menu Æ Display Æ Group see chap 6 4 1 The selection is invalid on scrolled display operation automatic change between groups Note If 7 values are defined in o...

Страница 43: ...ear illumination colour changes from blue to red on violation of the preset alarm set points Wet steam alarm Yes No If the temperature in a sat steam application gets to within 2 of the sat steam curve an alarm message occurs The display rear illumination colour changes from blue to red Sensor fault Yes No Failure of a sensor signal is indicated by a change of rear illumination colour to red Over ...

Страница 44: ... high fluctuating input signals Only for 0 4 and 20mA signals Fault conditioning Minimum Maximum value Last measured value Defines the behaviour of the output in a fault condition e g if the measurement of a sensor fails Value 999999 to 999999 0 0 Fixed value that is to be transmitted to the analogue output in a fault condition Note Only valid for the fault conditioning set up value selectable Sim...

Страница 45: ...on a unit fault Signal source Flow 1 Heat flow 1 Mass 1 Flow 2 etc not used Signal source for the selected alarm set points Note The number of signal sources is dependent on the number of applications and inputs set up Switch threshold 19999 to 99999 0 0 Smallest output value of the analogue output Hysteresis 19999 to 99999 0 0 Input of the return switch threshold of the alarm set point This is in...

Страница 46: ...tifier can be assigned to the pulse output in question for a better overview max 12 characters Signal Active Passive Relay Select Pulse output allocation Active Active voltage pulses are transmitted Power is supplied bythe device Passive Passive open collectors are available in this operating mode Power must be supplied externally Relay The pulses are transmitted to a relay Max frequency is 5Hz No...

Страница 47: ...is 50 Hz The suitable pulse value can be determined as follows Set width Yes No The pulse width limits the max possible output frequency of the pulse output Standard pulse width fixed i e always 100 ms User defined pulse width can be freely configured Pulse width 0 01 to 10 00 s Configuration of the pulse width suiting the external totalizer The maximum permitted pulse width can be calculated as f...

Страница 48: ... 500 Hz 1000 Hz 2000 Hz Off In this addressthe pulse output function can be simulated Simulation is active if the setting is not off Simulation ends if you leave this address Function Menu address Parameter set up Description Unit address 0 to 99 00 Unit address for communication using the serial interface RS232 Baudrate 9600 19200 38400 57600 Baudrate for the RS232 interface RS485 Baudrate 9600 1...

Страница 49: ...rameters Series no Unit series number Run time 1 Unit 2 LCD 1 Information how long the unit has been in operation protected by the service code 2 Information for the unit display operating time protected by the service code Function Menu address Parameter set up Description Service code Preset In this address the unit can be rest to all factory default settings protected by the service code Note A...

Страница 50: ...40 bar Temperature Pt100 temperature sensor 1 Flowmeter Setup Menu Flow Flow 1 Signal type PFM K factor 38 9 th A coeff 4 88x108 operating example see fig on the left 2 Pressure sensor Setup Menu pressure Pressure 1 Signal type 4 to 20 mA Start value 0 005 bar End value 40 bar Default 25 bar Pressure with which the RMS 621 will continue to operate on sensor failure 3 Temperature sensor Setup Menu ...

Страница 51: ...ixing slide RMS621X HC Display message Cause Cure Config error red display Pressure Analogue temperature PTx Temperature Analogue flow PFM pulse flow Applications Alarm set points Analogue outputs Pulse outputs Faulty or incomplete set up or loss of calibration data Incorrect terminal allocation Check that all necessary addresses have been defined using plausible values Chap 6 4 3 Main menu Setup ...

Страница 52: ...essage Cause Cure Wet steam alarm The steam calculated from temperature and pressure is 2 C above the saturated steam temperature danger of condensation of the steam Check the application transmitters and connected sensors If the WET STEAM ALARM is not required change the alarm set point function Setup Alarm set points Chap 6 4 3 or deactivate display colour change Setup Display Colour change Chap...

Страница 53: ...Channel ident Signal ident Input current is smaller than 3 6 mA or higher than 21 mA Incorrect cabling Sensor not set to 4 20 mA range Functional fault at sensor Incorrect end value set up on flowmeter Check sensor set up Check sensor function Check end value of connected flowmeter Check cabling Cable open circuit Channel ident Signal ident Too high resistance at the PT 100 input e g caused by sho...

Страница 54: ...power supply 18 to 36 V DC 20 to 28 V AC power supply 5 RMS621X DA RMS621X DB RMS621X DC RMS621X DD Display Front PCB for version without display Display front cover Display front cover neutral 6 RMS621A TA Temperature extension PCB Pt100 Pt500 Pt1000 complete incl terminals and fixing frame 7 RMS621A UA Universal input extension PCB PFM pulse analogue loop power supply complete incl terminals and...

Страница 55: ...tput terminal open collector 19 51004907 Extension board Input terminal 1 Pt100 Pt500 Pt1000 20 51004908 Extension board Input terminal 2 Pt100 Pt500 Pt1000 21 51004910 Extension board Input terminal 1 4 to 20 mA PFM pulse loop power supply 22 51004909 Extension board Input terminal 2 4 to 20 mA PFM pulse loop power supply 23 RMS621X1 CPU for energy manager for set up see below Controller CPU Oper...

Страница 56: ...by the service department of the supplier An overview of the E H worldwide service network can be found in the addresses on the back page of this operating manual Note When returning the unit for repair please add a description of the unit fault and application 9 6 Disposal The unit contains electronic components and must be disposed of accordingly Please take note of the national regulations when...

Страница 57: ...Resolution 13 Bit Fault recognition 3 6 mA and 21 mA limit as per NAMUR NE43 PFM Frequency range 0 25 Hz to 12 5 kHz Signal level 2 to 7 mA low 13 to 19 mA high Measurement method period length frequency measurement Accuracy 0 01 of measured value Temperature drift 0 1 10 K ambient temperature Pulse Frequency range 0 5 Hz to 12 5 kHz Signal level 2 to 7 mA low 13 to 19 mA high with approx 1 3 kΩ d...

Страница 58: ... Voltage level 0 to 1 V low 24 V high 15 Min load 1 kΩ Max pulse width 100 ms for frequencies 4 Hz Expansion cards digital passive open collector Frequency range of 0 5 Hz to 12 5 kHz Imax 200 mA Umax 24 V 15 Ulow max 1 3 V at 200 mA Max pulse width 100 ms for frequencies 4 Hz Connection terminals Power supply L N Input 1 2 0 4 to 20 mA PFM pul se 10 11 or 110 11 Input 1 2 TPS 82 81 or 83 81 Input...

Страница 59: ...nt alarm saturated steam alarm frequency pulse device error Switch behaviour Binary switches when the alarm value is reached potential free NO contact Relay switching capacity Max 250 V AC 3 A 30 V DC 3 A Note When using relays on expansion cards a mixture of low voltage and extra low voltage is not permitted Switching frequency Max 5 Hz Switching threshold Programmable wet steam alarm is preset t...

Страница 60: ...0 Hz Extra low voltage power unit 18 to 36 V DC or 20 to 28 V AC 50 60 Hz Power consumption 8 to 26 VA dependent on the expansion stage Connection data interface RS232 Connection 3 5 mm 0 138 in jack plug on front panel Transmission protocol ReadWin 2000 Transmission rate max 57 600 Baud RS 485 Connection plug in terminals 101 102 Transmission protocol serial ReadWin 2000 parallel open standard Tr...

Страница 61: ...IP 20 Remote operating and display unit IP 65 Electromagnetic compatability Interference emission EN 61326 Class A Interference immunity Power failure 20 ms no influence Start current limitation Imax In 50 T50 50 ms Elektromagnetische fields 10 V m as per IEC 61000 4 3 Medium Variable Range Water Temperature measuring range 0 to 300 C 32 to 572 F Temperature differential range DT 0 to 300 K Error ...

Страница 62: ...astic PC UL 94V0 Terminals Coded plug on screw terminals size 1 5 mm2 single core 1 0 mm2 stranded with ferrules valid for all connections 10 0 8 Human interface Display elements Display optional 132 x 64 Dot matrix LCD with blue background lighting Colour changes to red in the event of an error adjustable LED status display Operation 1 x green 2 mm 0 079 in Fault message 1 x red 2 mm 0 079 in Ext...

Страница 63: ...quirements demanded by the EU regulations Endress Hauser acknowledges successful unit testing by adding the CE mark Other standards and guidelines EN 60529 Degrees of protection by housing IP Code EN 61010 Safety requirements for electrical measurement control and laboratory instrumentation EN 61326 IEC 1326 Electromagnetic compatibility EMC requirements NAMUR NE21 NE43 Standardization association...

Страница 64: ...Documentation Product group Energy manager PG 006R 09 en Technical information System Components for DIN rail devices TI 367F 00 en Technical information PROline Prowirl 72 flowmeter TI 062D 06 en Technical information Energy manager RMS621 TI 092R 09 en ...

Страница 65: ...nal to the differential pressure Volume bbl 1 barrel for definition see Setup Æ Application gal 1 US gallon equals 3 7854 litre igal Imperial gallon equals 4 5609 litre l 1 litre 1 dm3 hl 1 Hektoliter 100 litre m equals 1000 litres ft eequals 28 37 litres Temperature Calculation factor 0 C 273 15 K C F 32 1 8 Pressure Calculation factor 1 bar 100 kPa 100000 Pa 0 001 mbar 14 504 psi Mass ton US 1 U...

Страница 66: ...following data Internal pipe diameter Diameter ratio ß the K factor on Pitot tubes ƒ Correction factor measurement correction e g taking the pipe roughness into consideration Pitot tubes When using Pitot tubes a correction factor needs to be entered instead of the pipe diameter ratio This factor resistance value is allocated by the sensor manufacturer On the E H Deltatop this is in the form of the...

Страница 67: ...ed in the device using the operating density dependent on the temperature and pressure Here it is a partially compensated flow rate calculation because the rated squared density is contained within the operating volume see above How should the device and sensor be set up Example Accuracy of a steam flow measurement using an oriface plate dependent on measurement method Corner tap orifice plate DP0...

Страница 68: ...p Curve Units Format Sums Pipe data etc valid for all transmitters Note For Splitting Range operation differential pressure transmitters that transmit a current 20 mA 21 mA on exceeding the measurement range must be used The change between measuring ranges is fully automatic hysteresis in the threshold point Fig 27 Splitting range operation Mean value calculation averaging The mean value calculati...

Страница 69: ...ted Table with up to 10 paired values flow factor ƒ Note When using a Pitot tube sensor the so called resistance value ζ blockage factor can be mirrored by the correction factor ƒ Should the resistance value be constant then it is sufficient to define two paired values flow correction factor This correction factor is then valid for the total measurement range Note The correction points are automat...

Страница 70: ...limits a further input for the operating pressure of the water network is required The average operating pressure p is a preset value not an input signal The pressure can only be entered as an average signal even if the pressure is measured using a pressure sensor Calculated values Calculation of mass flow heat flow specific Enthalpy density IAPWS IF97 Standard Output values display at the unit He...

Страница 71: ... points with the input values measurements q T Two measurement points are covered by the basic unit Expansion cards are required if further measurement points are to be added Each expansion card is fitted with outputs analogue impulse for retransmission of process values Relay outputs are also available Diagram calculation formula T q E q T p h T E Heat quantity q Operating volume Density T Operat...

Страница 72: ...ting pressure p is a preset value not an input signal The pressure can only be entered as an average signal even if the pressure is measured using a pressure sensor The flow meter installation point is selectable The installation point is defined as the warm cold side and not the inflow return as this definition is clear for all operating modes It is recommended to place the flow meter in a positi...

Страница 73: ...by the basic unit Expansion cards are required if further measurement points are to be added Each expansion card is fitted with outputs analogue impulse for retransmission of process values Relay outputs are also available Diagram calculation formula T2 q T1 Heat output heating E q T1 p h T1 h T2 Heat input cooling E q T1 p h T2 h T1 E Heat quantity q Operating volume Density T1 Temperature in inf...

Страница 74: ... exact calculation of the process values and measurement range limits a further input value for the operating pressure of the water network is required The average operating pressure p is a preset value not an input signal The pressure can only be entered as an average signal even if the pressure is measured using a pressure sensor The flow meter installation point is selectable The installation p...

Страница 75: ... to 3 measurement points with the input values measurements q T1 T2 plus a direction signal with flow direction change if required Expansion cards are required if further measurement points are to be added Each expansion card is fitted with outputs analogue impulse for retransmission of process values Relay outputs are also available Diagram calculation formula T2 q T1 Heat output heating E q T1 p...

Страница 76: ...ly memorised saturated steam curves Note For higher accuracy or for control purposes it is recommended to calculate the steam condition using 3 inputs super heated steam This is recommended because in this operating mode the wet steam alarm function see outputs can be used Output values display at unit Heat flow mass flow flow operating volume temperature pressure density specific Enthalpy Heat qu...

Страница 77: ...e required if further measurement points are to be added Each expansion card is fitted with outputs analogue impulse for retransmission of process values Relay outputs are also available b Saturated steam Up to 3 measurement points with the inputs measurements q p T One measurement point is covered by the basic unit expansion cards are required if further measurement points are to be added If only...

Страница 78: ... the internally memorised saturated steam curves Note For higher accuracy or for control purposes it is recommended to calculate the steam condition using 3 inputs super heated steam This is recommended because in this operating mode the wet steam alarm function see outputs can be used Output values display at unit Mass flow flow operating volume temperature pressure density Mass sum flow sum Outp...

Страница 79: ...uired if further measurement points are to be added Each expansion card is fitted with outputs ana logue impulse for retransmission of process values Relay outputs are also available b Saturated steam Up to 3 measurement points with the inputs measurements q p T One measurement point is covered by the basic unit expansion cards are required if further measurement points are to be added If only the...

Страница 80: ...ontents steam minus heat contents condensate density specific Enthalpy IAPWS IF97 Standard Only 2 inputs are required for saturated steam calculations flow pressure temperature the missing input is calculated using the internally memorised saturated steam curves Note For higher accuracy or for control purposes it is recommended to calculate the steam condition using 3 inputs super heated steam Thi...

Страница 81: ...en up to 3 measurement points using the inputs q p Tp Tw One measurement point is covered by the basic unit Expansion cards are required if further measurement points are to be added Each expansion card is fitted with outputs analogue impulse for retransmission of process values Relay outputs are also available Diagram calculation formula TW q p TD E q p TD hD p TD hw TW E Heat quantity q Operatin...

Страница 82: ... differential Enthalpy IAPWS IF97 Standard Only 2 inputs are required for saturated steam calculations flow pressure temperature the missing input is calculated using the internally memorised saturated steam curves Note For higher accuracy or for control purposes it is recommended to calculate the steam condition using 3 inputs super heated steam This is recommended because in this operating mode ...

Страница 83: ...am then up to 3 measurement points using the inputs q p Tp Tw One measurement point is covered by the basic unit Expansion cards are required if further measurement points are to be added Each expansion card is fitted with outputs analogue impulse for retransmission of process values Relay outputs are also available Diagram calculation formula TD P q TW E q TW hD pD TD hw TW E Heat quantity q Oper...

Страница 84: ...rated steam temperature which is equal to the pressure in front of the heat exchanger Only 2 inputs are required for saturated steam calculations flow pressure temperature the missing input is calculated using the internally memorised saturated steam curves Note For higher accuracy or for control purposes it is recommended to calculate the steam condition using 3 inputs super heated steam This is ...

Страница 85: ...ansion card is fitted with outputs analogue impulse for retransmission of process values or relay b Saturated steam Up to 3 measurement points with the inputs measurements q p Tp One measurement points are covered by the basic unit Expansion cards are required if further measurement points are to be added If only the inputs q and T are being used 2 measurement points can be covered by the basic un...

Страница 86: ... 31 Main menu Set up 33 O Operating example 27 Output connections 18 Outputs 31 P Palm key pad 26 Passive sensors 16 Process error messages 27 Process errors definition 27 Q Quick Setup Operating matrix 23 R Remote display operating module 20 Repairs 56 RMS 621 main menu 22 S Setup Alarm set points 44 Setup Analogue outputs 43 Setup Application 39 Setup Communication 48 Setup Display 42 Setup Extr...

Страница 87: ...ignal type Start value End value Pulse value Eng Units Pressure Signal type Start value End value Eng Units Temperature Signal type Start value End value Eng Units Outputs Signal source Signal type Start value End value Pulse value Eng Units For terminal connections see next page Expansion cards Application type ...

Страница 88: ......

Страница 89: ...tmosphere Pressure Default Mean value Number Sensor 1 3 Time base Units Format Sums Inputs temperature Temperature 1 1 3 2 Identifier Signal Sensor type Terminals Units Format Signal damp Start value End value Offset Default Mean value Number Sensor 1 3 Time base Units Format Sums Application Application 1 3 Identifier Application Steam type Input types Op mode Flow direction Term direction sig Fl...

Страница 90: ...www endress com worldwide BA 127R 09 en 08 04 510 04788 FM SGML6 0 ...

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