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E-880-2N-E

7. CALCULATION FORMULAS

7.1 Conversion to Mass Units (Total mass flow)

In saturated steam calculation, the temperature and pressure fed to the instrument are used in our
proprietary formula of approximation to determine speci

ﬁ

c weight V", from which conversion is performed

with respect to the

ﬂ

ow input.

W = a

×ε

×〔

＋

〕

where W

：

Mass

［

］

：

Meter factor of the

ﬂ

owmeter

［

l/P

］

：

Input pulse

：

Relative density

［

kg/m

= g/l

］

：

Meter's correction factor relative to temperature variation

＋

α（

－

）

t = Operating temperature

［℃］

= .8

－

(stainless steel)

：

Meter's correction factor relative to pressure variation

(ε

p = always ""

：

Meter error correction of the

ﬂ

owmeter

［

］

7.2 Conversion to Calorific Value (Total calorific flow)

Similar to obtaining the speci

ﬁ

c weight above, speci

ﬁ

c enthalpy h is determined and, based on mass

conversion value W, calori

ﬁ

c conversion is performed.

＝

where Q

：

Calori

ﬁ

c value

［

］

：

Speci

ﬁ

c enthalpy

［

kJ/kg

］

7.3 Instant Mass Flowrate

＝

×ε

×〔

＋

〕×

where Wm

：

Instant mass

ﬂ

［

g/h

］

：

Input pulse frequency

［

P/s

］

Содержание EL4101

Страница 1: ...the information and knowledge contained in this manual you can expect the best possible results over a long service life of this instrument Keep this manual for ready reference It is suggested that the instruction manuals for the companion pulse generator flowmeter and receiving instrument be referred to at the same time STEAM FLOW COMPUTER Saturated steam service Model EL4101 ...

Страница 2: ... Conversion total calorific flow 2 Instant Mass Flowrate 2 8 PREPARATIONAL CHECKS AND OPERATION 8 Preparation Before Operation 8 2 Preparational Checks 8 Operation TROUBLESHOOTING 0 ERROR MESSAGES BEHAVIOR IN ERRATIC CONDITIONS 2 OVERALL BLOCK DIAGRAM PRODUCT CODE EXPLANATION CONVENTIONS Shown in this manual are the signal words NOTE CAUTION and WARNING as described in the examples below NOTE Note...

Страница 3: ...MODE 2 8 EL 0 0 EL 0 0 DIP SWITCH CONFIGURATION 82 Model with communication capabilities COMMUNICATION MANUAL Ins No E 880CM E CONTENTS COMMUNICATION CAPABILITY OVERVIEW 2 NETWORK CONFIGURATION MODE SELECTION LOCAL REMOTE SELECTION 8 SETUP ITEMS FOR COMMUNICATION 0 COMMUNICATION PROCEDURE COMMUNICATION FORMAT 2 8 BCC SUM CHECK CR LF 0 CODES ASSIGNED TO UNITS 8 ASCII CODE ...

Страница 4: ...you inquire supply complete informa tion as to the product name model number product number ratings and other pertinent information 1 2 Transportation Precautions In order to safeguard against damage during transit transport your instrument to the installation location in the original package used for shipment from the factory if possible 2 Use care to avoid impact shocks to the instrument during ...

Страница 5: ... pulse output and an instant flowrate analog output mass equivalent 2 1 Features Changing the meter factor ranges of temperature pressure or other parameters of the companion flowmeter is simple by keystrokes on the front panel keypad or by inserting an IC card into the slot 2 Built around a microprocessor the instrument carries out calculations entirely in digital signal processing circuits to ac...

Страница 6: ...ure Provide a sufficient working space behind the instru ment at least 0 centimeters from the back panel of the instrument to facilitate wiring and servicing 3 2 2 Panel Use a rigid steel sheet with a minimum thickness of millimeters 2mm thick is recommended 2 If it is required to install instruments alongside each other dimensions in Fig 2 are suggested Recommended mounting height is given in Fig...

Страница 7: ...ring ensure good electrical connections Terminals are found on the back of the instrument Fig 4 3 Description of Terminal Blocks for External Connections Terminal blocks for external connections TB TB2 and TB are found on the back of the instru ment as shown in Fig Terminal identification appears in Table while terminal connections appear in Table 2 NOTE TB and TB2 terminal numbers are indicated o...

Страница 8: ... flow Static relay 8 8 Pulse out 2 No Polarity Total calorific flow Static relay 0 Pulse out No polarity Alarm out Static relay 0 2 TB No Label Description Power H 8 to 2 VAC or 20 to 0VDC 2 N Ground Screws on the terminal block M Table 2 Terminal Connections Output sync with input signal O C wire generator 2 wire generator NOTE Mode provided with communication interface to 20mADC to VDC ...

Страница 9: ...s Total calorific flow Same as output pulse unit Mcal for example Instant mass flowrate kg h for example Pressure To the th decimal place when MPa is selected Correction factor To the th decimal place Correction factor 2 To the th decimal place Meter error corr fctr To the th decimal place Meter correction fctr To the th decimal place Specific weight To the th decimal place when kg m is selected S...

Страница 10: ...ed If a problem arises in the course of pressure conversion such as out of scale a default fallback value is indicated Correction factor COMP FACTOR The value determined by correction factors and the relative density is indicated Correction factor Meter error correction factor Meter correction factor Relative density Correction factor 2 COMP FACTOR2 The value determined by correction factors the r...

Страница 11: ...ys Fig 2 Touch Key Operation 6 1 3 Error Messages When an erratic condition arises an error message automatically appears on the display The information represented by error messages are listed on page If two or more concurrent errors are involved individual messages will be scrolled at intervals of approximately seconds When an error condition disappears an error message automatically goes out an...

Страница 12: ...nsity kg m g l εt Meter s correction factor relative to temperature variation εt α t 20 t Operating temperature α 8 0 stainless steel εp Meter s correction factor relative to pressure variation εp always E Meter error correction of the ﬂowmeter 7 2 Conversion to Calorific Value Total calorific flow Similar to obtaining the speciﬁc weight above speciﬁc enthalpy h is determined and based on mass con...

Страница 13: ...tion displayed See the KEY OPERATION MANUAL Inject a simulated input pulse train or density signal representing the type of the companion pulse generator Select display menu items of the total mass flow and total calorific flow and make sure that incoming pulses are being accumulated Also verify that pulse output and analog output are properly generated Remove the simulated pulse input and compare...

Страница 14: ...t wiring is faulty 2 Pressure transmitter is faulty A fault in internal assembly Faulty relative density and or specific enthalpy reading Temperature and pressure readings correct A fault in internal assembly While steam is allowed to flow Fails to count pulses fails to produce a pulse output Input signal line correctly wired 2 Pulse signal coming in Pulse generator specifications matched Incorrec...

Страница 15: ...ERT ERROR Density converter circuit error TEMP PT OVER Temperature Pt input overflow TENP PT UNDER Temperature Pt input underflow TEMP 2 PT OVER Temperature Pt input 2 overflow TEMP 2 PT UNDER Temperature Pt input 2 underflow 8 TEMP ANA OVER Analog temperature input overflow TEMP ANA UNDER Analog temperature input underflow 20 TEMP 2 ANA OVER Analog temperature input 2 overflow 2 TEMP 2 ANA UNDER ...

Страница 16: ...ut Ckt analog Temp Input Ckt analog Temp Input Ckt Pt Analog Output Circuit Pulse Output Circuit 1 Pulse Output Circuit 2 Pulse Output Circuit 3 Multi plexer Isolation Test Pins Test Pins Internal Volt Buzzer Motherboard Keyboard IC Card 128 128 dots ST Display RUN 8 keys Isolation Isolation Isolation Isolation Parallel I O Timer Counter Parallel I O CPU 20MHz Memory RS485 Isolation IC Card Interf...

Страница 17: ... Non A L Alarm output Others Z Z Special N Non Output item 3 affix code Hyphen N Non Output item 1 Output item 4 Pulse output 1 Analog output assignment M 1 Total mass flow pulse width 1ms M Instantaneous mass flow M 5 Total mass flow pulse width 50ms Z Special M 9 Total mass flow pulse width special Analog output hard H 1 Total calorie flow pulse width 1ms 2 1 5V H 5 Total calorie flow pulse widt...

Страница 18: ...E 880 2N E All specifications are subject to change without notice for improvement 2017 09 Revised 2008 08 Released E 880 2N E 1 ...

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