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.