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one-way pressure.

4.3.3 Using with negative migration (see below figure)

If it is inconvenience for installing condensing tank, or in order to prevent

corrosive medium into negative pressure side, we can use spacer fluid as

figure 4. In this situation, the differential pressure of the instrument is:

ΔP=r1(H

＋

H0)

－

r2h=r1H

－

(r2h

－

r1H0)

Volume of migration

：

B=r2h

－

r1H0

Range

：

P=r

For example

：

r1=1.4g/cm3

，

r2=0.89g/cm3

H=500mm

，

H0=100mm, h=1700mm

Range

：

ΔP=r1·1=1.4×500=2100(mmH2O)

Highest
liquid
level

Lowest
liquid
level

Transmitter

Condensi
ng tank

No valve

Nc valve

Содержание P064 Series

Страница 1: ...www eyc tech com 1 P064 SERIAL DIGITAL INTELLIGENT PRESSURE TRANSMITTER DIFFERENTIAL PRESSURE TRANSMITTER INSTRUCTION MANUAL ...

Страница 2: ...flammable environment when power is on 7 Please check if the transmitter power supply voltage meets the power supply voltage requirements in the manual 8 The external grounding screw of the transmitter should be connected to the ground securely 9 The installation of the transmitter in an explosive environment must comply with international national and local standards specifications and guidelines...

Страница 3: ...www eyc tech com 3 communication equipment and software provided by the manufacturer ...

Страница 4: ... 2 4 Intrinsic Safety Explosion proof Type Transmitter System Wiring Diagram 17 2 5 Isolation Explosion proof Type Transmitter Instruction 18 3 Debugging and Operation 19 3 1 Overview 19 3 2 Button Operation for the Transmitter without the LCD Display 20 3 3 Button Operation for the Transmitter with the LCD Display21 4 The flange transmitter installation operation instructions 26 4 1 Overview 26 4...

Страница 5: ...rk focuses on reliability stability high precision and intelligence The transmitter has powerful interface operation function The digital header can display pressure percentage current and 0 100 analog indication By key operation zero point shift range setting and damping setting can be easily completed without standard pressure source The setting of basic parameters is very convenient for on site...

Страница 6: ... transmitter working principle 1 2 1 Working principle Figure 1 1 is an electrical block diagram of the basic working principle of an intelligent transmitter The working principle and functions of the various components will be described below 1 Introduction ...

Страница 7: ...ensure precise correction and engineering unit conversion In addition the microprocessor can also perform sensor linearization turndown ratio damping time and other functional settings 3 EEPROM memory The EEPROM stores all configuration characterization and digital trimming parameters This memory is non volatile so even if the power is turned off the stored data can be kept intact so that intellig...

Страница 8: ...y and buttons The Intelligent transmitter with liquid crystal display can display the pressure value current value 0 100 ratio display and temperature value of the sensor measured by the transmitter and the transmitter can be configured through the buttons on the LCD panel Intelligent transmitters without display can also be used to clear actively calibrate the transmitter through the S and Z butt...

Страница 9: ...Figure 2 2 Piezoresistive transmitter installation After loosening the locking screw the electronic compartment can be rotated 90 left and right As shown in Figure 2 3 Warning Do not rotate more than 90 So as not to break the internal cable Figure 2 3 Housing rotation ...

Страница 10: ...tion hole distance adjustment of differential pressure transmitter The process connection holes on the pressure chamber are 1 4 18 NPT These process connection holes require a thread seal When using a waist flange joint the transmitter can be easily removed from the production unit by simply removing the upper and lower bolts of the joint The center distance between the two process connection hole...

Страница 11: ...ads in the pressure tubes on both sides of the differential pressure transmitter 5 Install the pressure tube in a place with small temperature gradient and temperature fluctuation 6 Prevent from the crystallization or low temperature freeze in the pressure tube 2 2 Relevant Issues of measurement methods Liquid measurement When measuring the flow rate of the liquid the pressure tap should be opened...

Страница 12: ...d be filled with water to prevent the steam from directly contacting the transmitter so that the volume change of the transmitter is negligible when the transmitter is working and there is no need to install a condensing tank Level measurement The differential pressure transmitter used to measure the liquid level is actually the static head that measures the liquid column This pressure is determin...

Страница 13: ...sure side of the transmitter Thus the pressure in the container acts on both the high and the low pressure sides of the transmitter at the same time As a result the differential pressure obtained is proportional to the product of the liquid level and the specific gravity of the liquid Pressure connections 1 Dry pressure connection If the gas above the liquid does not condense the connecting tube o...

Страница 14: ...ference between the pressure tubes on both sides due to the temperature difference causing pressure head error The methods of reducing the errors are as follows 1 The pressure tube should be as short as possible 2 The pressure tube should be connected upward to the process pipeline and its slope should be less than 1 12 When measuring liquid or steam 3 For the gas measurement the pressure pipe sho...

Страница 15: ...process pipeline The length and diameter of the pipes through which the cleaning agent passes should be the same The cleaning agent should be prevented from passing through the transmitter 2 3 Electrical Installation Wiring diagram of system Figure 2 6 Note 1 Please refer to the usage methods of distributor and safety barrier if the users require the distributor or safety barrier according to the ...

Страница 16: ... better if the stranded wire is used The signal line should not be arranged together with other power lines or near the heavy current installation The threading hole of the transmitter housing should be sealed or inserted with a plug coated with the sealant so as to prevent the moisture accumulation in the housing If there is no sealing for the wiring during the transmitter installation the thread...

Страница 17: ...high temperature or high supply voltage 2 4 Intrinsic Safety Explosion proof Type Transmitter System Wiring Diagram Ui 28v DC Um 250V AC DC Ii 30mA Uo 28V DC Pi 0 84W Io 30mA Notes Please refer to GB3836 4 2000 standards for the definitions of Vm Vo Io Po Vi Ii and Pi The maximum allowable distributed capacitance CP for the wire or cable connection between the guard grating and the transmitter is ...

Страница 18: ...forbidden to open or loosen the end cover or housing under the energized condition on site The isolation explosion proof type transmitter has two outlet ports and one of them is adopted for leading in cable connection and its cable connector should adopt the dedicated compression nut type explosion proof leading in device The tightly screwed hollow bolt gasket sealing rubber ring are set along the...

Страница 19: ...orming to the regulation of the national standard GB3836 2 2000 Explosion proof Electrical Equipment and Isolation Explosion proof Type Electrical Equipment d Applied in the Explosive Environment and its symbol is EXdsⅡBT5 3 1 Overview Panel Figure for the Circuit Board without Display Figure 3 1 3 Debugging and Operation ...

Страница 20: ...power on status and in the status of zero pressure compression press and hold both S button and Z button for more than 5 seconds then release the two buttons at the same time press and hold the two buttons again for about 2 seconds and the transmitter will be reset according to the current pressure value 3 2 2 Lower limit calibration Zero point active transfer Please make sure the transmitter is i...

Страница 21: ...s at the same time press and hold S button again for about 2 seconds and the transmitter will adopt the current pressure as the upper limit of the pressure range but the lower limit of the transmitter pressure range won t be changed For example the pressure range of the transmitter is 0 5kpa and the current pressure is 4kpa after this operation is carried out the pressure range of the transmitter ...

Страница 22: ...on S Return key under menu condition Shift key under parameter setting condition this key also have S key function of 3 2 item M Ack key of menu and parameter Z Selection key under menu condition Shift key under parameter setting condition this key also have Z key function of 3 2 item ...

Страница 23: ... 3 Configuration operation Make sure the transmitter has been turned on with the measurement display situation when the transmitter has been made a configuration operation Press and hold down M key 5 seconds and release the key after showing the ...

Страница 24: ...The M key also can return to the previous menu For example 1 Modifying unit On the main menu interface Press Z key and up and down arrow keys to move options Select range unit and press M key Press Z key and up and down arrow keys to move options Select unit and press M key Press Z key to select unit and confirm by pressing M key If we can see on the right side that will be succeed or we should ch...

Страница 25: ...ceed or we should check if the key write protection is turned off Save and return to the previous menu by pressing M 4 Factory reset On the main menu interface Press Z key and up and down arrow keys to move options Select damping time and short press M key Select modifying place by pressing S key and short press Z key to modify the figure as 88 888 Save by pressing M The parameter of transmitter w...

Страница 26: ...replace the measured medium Make sure the measuring head is cleaned Capacitive flange differential pressure or pressure transmitter will be used to measure the differential pressure parameter of liquid gas and vapor and the liquid level interface and density of liquid The measuring head can measure the flow rate of gas liquid and vapor and put the measured signal changed into 4 20mA DC two wire sy...

Страница 27: ...e restrictions on the height difference between pressure transmitter and flange and differential pressure level transmitter and flange We can see the data as below Range No Permissible height difference Filling silicone oil Filling fluorocarbon oil 4 3 84 1 89 5 19 2 9 48 6 7 8 Without this limit When pressure transmitter and flange or differential pressure level transmitter and flange are not in ...

Страница 28: ...r inwall at least next to tower inwall The measured medium may abrade the diaphragm if it has big flow rate and strong grinding It can be used after adopting corresponding measures The measurement computing method of flat flanged level transmitter and inserted flanged level transmitter is same 4 3 2 Using without migration see below figure The instrument should be installed in the lowest liquid le...

Страница 29: ... negative pressure side we can use spacer fluid as figure 4 In this situation the differential pressure of the instrument is ΔP r1 H H0 r2h r1H r2h r1H0 Volume of migration B r2h r1H0 Range P r For example r1 1 4g cm3 r2 0 89g cm3 H 500mm H0 100mm h 1700mm Range ΔP r1 1 1 4 500 2100 mmH2O Highest liquid level Lowest liquid level Transmitter Transmitter Condensi ng tank No valve Nc valve ...

Страница 30: ...r in order to isolate the corrosive medium from the negative pressure side the spacer fluid can be used as shown in figure 4 In this case the differential pressure of the instrument is ΔP r1 H H0 r2h r1H r2h r1H0 Migration B r2h r1H0 Range P r Example known r1 1 4g cm3 r2 0 89g cm3 H 500mm H0 100mm h 1700mm Range ΔP r1 1 1 4 500 2100 mmH2O ...

Страница 31: ...www eyc tech com 31 Negative displacement B r2h r1H0 0 8 700 1 4 100 1220 mmH2O Before installation the range shall be adjusted to 1220 880 mmH2O ...

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