The flow differential pressure transmitter is a new type of transmitter that integrates differential pressure transmitter, temperature transmitter, and flow integrator. It can display working pressure, temperature, instantaneous, and cumulative flow. And it can automatically compensate for temperature and pressure of gas and steam, realizing the function of directly displaying standard flow rate and mass flow rate on site. With an external 24V power supply, it can also provide current, frequency, and 485 personnel transmission output. And it can work with a battery for 2-3 years and can be directly used with differential pressure flow meters.

The flow differential pressure transmitter is a field display differential pressure flow temperature pressure transmitter. The revolutionary battery powered ultra wide range ratio is 1:400, and the differential pressure flow multi parameter transmitter has high accuracy of 0.1 level temperature and pressure integration. The ZS-3051DP completely surpasses the new generation battery powered low-power flow differential pressure transmitter of similar foreign products. The battery can be used for 3-5 years and the range ratio is 1:200.

Flow differential pressure transmitter

Product features:

1. Applicable to all differential pressure flow sensors

2. Battery powered on-site display without external power supply

3. Fully isolated output with strong anti-interference design, shielding all interference

4. Can output pulse, current (4-20mA), 485 (modbu rtu) signal (requires external power supply)

5. Equipped with temperature and pressure sensors

6. Automatic temperature and pressure compensation for gas and steam

7. Range ratio 1:60 1:100 1:200

8. Accuracy level 0.1, 0.2, 0.5

9. Gas can display parameters such as temperature, pressure, operating flow rate, and standard flow rate

10. Steam can display parameters such as temperature, pressure, density, mass flow rate, etc

Technical parameters:

The flow differential pressure transmitter is suitable for use with Anuba, Deltaba, Widiba, Balance, V-cone, orifice plate, nozzle, and Venturi flow sensors. It can be powered by batteries for on-site display without the need for external power supply. It has fully isolated output and strong anti-interference function, shielding all interference. It can output pulse, current (4-20mA), 485 (modbu rtu) signals that require external power supply. The range ratio is 1:100, 1:200, 1:400, and the instrument accuracy can be selected from 0.5, 0.2, 0.1, and 0.05 levels. Gas can display parameters such as operating flow rate and standard flow rate, while steam can display parameters such as density and mass flow rate.

current output

1. Output two-wire 4-20mA 2, load resistance: 0~600 Ω

3. Response time:<1 second 4. Basic error: ± 0.5% (20 ℃± 5 ℃)

5. Environmental conditions: Temperature: -40-85 ℃ Humidity: ＜ 85％

6. Power supply: ± 24VDC ± 15% 7. Power supply current:< 60mA

pulse

1. Working voltage: 12VDC~+24VDC 2, working current<50mA

3. Pulse output amplitude Vh=24V, VL<1V. 4. Frequency output: 0~1000Hz

485 output protocol: modbus rtu

The instrument uses packet 04 to send 3 floating-point variables with 12 consecutive bytes, which are instantaneous flow rate 6 bits (4 bytes), cumulative flow rate low 6 bits (4 bytes), and cumulative flow rate high 6 bits (4 bytes), respectively,

Accumulated traffic low 6 bits: Address 30001, （0-999999）

Accumulated traffic up to 6 digits: Address 30003, （0-999999）

Instantaneous flow rate 6-digit: Address 30005, （0-999999）

Protection level: IP65 Explosion proof level: Ex Ⅱ dCT4 (design)

Precautions for using flow differential pressure transmitter

● Installation precautions

Usually, when installing transmitters, attention should be paid to horizontal installation, and special instructions should be made when ordering vertical installation. The transmitter cannot be installed at an angle, especially when there is a slight differential pressure.

● Flow pressure temperature switching operation

The flow differential pressure transmitter can switch between displaying instantaneous flow rate, temperature, pressure, and density (only for steam). Press the key once to enter the switching state, and press the key to fix it in the current display parameter state (for example, when switching to temperature display, press the key to fix the displayed temperature, and then press the key again to enter the switching state).

485 communication sampling time

The sampling time for 485 communication should be greater than 1000ms. If the sampling time is too fast, it will cause the battery to consume too quickly.

Differential pressure measurement

The current instantaneous flow displays the voltage value (mV) corresponding to the differential pressure, and the corresponding relationship is 0-2000mV corresponding to the 0-scale differential pressure range, which can calculate the differential pressure. For example, if the current scale differential pressure is 40Kpa and K25 or K32 is set to 4000, the instantaneous display is 500, then the differential pressure is 500 ÷ 2000 × 40=10Kpa

When the battery is depleted and there is no need to repurchase the battery, an emergency backup power solution can be used. Connecting to a battery power supply of DC5-12V will enable the instrument to function properly. A connector will be provided with the transmitter packaging, with the red line being positive and the black line being negative. Connect the positive and negative power sources of the battery and plug them into the socket to use.

Measurement of saturated steam

The measurement of saturated steam can choose pressure compensation or temperature compensation. Usually, pressure compensation is chosen so that temperature sensors do not need to be installed and there is no need to drill holes in the sensors or pipelines to install temperature sensors. At this point, the temperature sensor does not need to be installed. In this case, the JT0 jumper on the wiring board needs to be short circuited, and the analog temperature sensor on the transmitter can be used. At this point, the Rt potentiometer can be adjusted to simulate the current temperature. If the temperature sensor is connected, JT0 needs to be disconnected, otherwise the temperature cannot be measured normally.