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Two-wire 4-20mA working method, support range migration, small signal removal, zero zero clearing function.
The sensor constant current constant pressure excitation, suitable for diffusion Silicon, ceramic piezorescence, strain gauge, floating ball liquid level and other sensors.
Industrial temperature range -40 °C ~ 85 °C, import voltage Benchmark, circuit board temperature drift & lt; 35 ppm.
The enhanced protection circuit design has as many as 10 protective devices for the entire board. It has a variety of protections such as Overflow, overpressure, and reverse connection, and is more reassuring to use on the spot.
The wide power supply 5 ~ 30V power supply, the minimum 5V power supply can output 4 ~ 20mA current ring, can meet the special use of similar 10 ~ 12V power supply.
Single line debugging, debugging line can be used for zero clearance function, convenient for users on-site clearance.
Full digital calibration, easy and fast

Power voltage: 5 ~ 30 VDC, recommended 24 VDC.
Constant-current excitation: 0.5 mA, suitable for Constant-Current power supply sensors(2 ~ 5 kΩ).
Constant pressure excitation: 2.5 VDC, suitable for constant pressure excitation sensors(ceramic, strain, glass micro-melting, etc..)
Working environment: temperature -40 ~ 85 °C, humidity & lt; 85 %, dry and non-perishable environment.
Shape size: length(27mm) * width(19mm) * height(4.5 mm).
Load resistance:(VCC-5) / 20mA
Current output resolution: approximately 1.2 uA
Temperature drift coefficient: & lt; 35 ppm / °C

外形图

接口说明

L +: Circuit board power supply; L-: Circuit board power supply negative
I +: Sensor constant current excitation; I-: Sensor constant current excitation negative;
V +: Sensor constant pressure excitation; I-: Sensor constant pressure excitation negative;
TS: The circuit board debugging interface is also a zero interface.

Note:
1. The normal power supply range of the circuit board is 5 to 30 VDC, and the circuit can not work properly beyond this range.
2. The sensor constant current excitation current is 0.5 mA, and the corresponding internal resistance of the sensor is 1 to 5KΩ. When the internal resistance of the sensor exceeds this range, it will affect the nonlinear nature of the transmitter. Note that it should be used.
3. The constant voltage excitation voltage of the sensor is 2.5 V. For strain sensors, the internal resistance must not be less than 1KΩ.

Master variable zero
1. The primary variable clearing zero, PV clearing zero, is the zero point at relative atmospheric pressure, not the zero point of the sensor range. The transmitter is placed directly under atmospheric pressure, the transmitter is recharged, and the debugging line and the transmitter are negatively shortened by 5 to 10 seconds, and then the debugging line and the power supply are negatively shortened by 3 to 5 seconds to perform zero. function.
2. If the transmitter has already performed a zero clearing operation, the zero clearing operation will be restored when this zero clearing operation is performed. If you want to re-zero the zero clearing operation, you need to perform another zero clearing operation.
3. The zero clearance range is 25 % of the variable delivery range, and zero clearance functions will not be performed if this range is exceeded.
4. The zero clearing operation is only valid for 30 seconds of electricity on the transmitter, and zero clearing is not performed beyond this time.

Debugging Calibration
The company professional debugging tools and debugging software for the convenience of customer debugging and use。 Professional debugging tools have RS232 interface to connect the computer calibration setup software. You can also work independently without a computer. It can realize range migration, small signal excision and other functions, so as to facilitate the use of customers and improve production efficiency.