GW-ZC type differential expansion monitoring instrumentDetailed product description：

One Introduction
The GW-ZC differential expansion monitoring instrument is a precision intelligent measurement and control instrument widely used in departments such as power, petroleum, and chemical engineering. By using GD type eddy current sensors, the difference in axial expansion between the rotor and cylinder during preheating of large rotating machinery can be measured and monitored. Equipped with 4-20mA current output and RS485 (RS232) interface, it can be connected to computers and other devices. The monitor adopts LED digital display, PVC color facial mask and light touch keys, through which the alarm value can be set according to their own needs. At the same time, the rear panel of the monitor is equipped with switch signal output to protect the monitoring equipment. The appearance of the monitoring device is beautiful, the structure is reasonable, the installation is simple, the performance is stable, and the quality is reliable.

II Main functions
Calibration function
The range can be adjusted directly through the front panel buttons (already set before leaving the factory, users do not need to set it again to avoid range errors)
display function
The measured values of differential expansion, alarm, and shutdown settings can be displayed separately on the LED digital tube.
alarm function
When the expansion difference exceeds the alarm set value, the alarm indicator light will turn on, and at the same time, a switch signal will be output on the rear panel to protect the monitored equipment. The alarm value can be set according to one's own needs through the buttons on the front panel.
output interface
Equipped with 4-20mA current output RS485（RS232）， Can be connected to devices such as computers, DCS, PLC, etc.

3、 Technical parameters
Displacement display: 4-digit 0.8-inch LED digital display
Range: -5 to 5mm
Accuracy: ± 2% (full scale)
Frequency response: 0-3KHZ
Current output: 4-20mA
Relay output: DC28V/1A, AC250v/5A
Working environment: Temperature: -30 ℃~60 ℃ Relative humidity: ≤ 85%
Working power supply: AC220V/50Hz ± 30%
Installation method: disc type

4 Selection Guide
The differential expansion monitoring instrument is equipped with GW-DO type eddy current sensor.
GW-ZC—A□□—B□□—C□□—D□□
Range selection: A □□
0 1: -3～0～3mm
0 2: -4～0～4mm
0 3: -5～0～5mm
Current output: B □□
0 1: 4～20mA
0 2: 0～10mA
Sensor selection: C □□ (GW-DO type eddy current sensor)
0 1: Ø 18mm sensor
0 2: Ø 25mm sensor
0 3: Ø 36mm sensor
Installation direction: D □□
0 1: Increase distance from the probe
0 2: Reduced distance from the probe