TWI-PH1: Loop-Powered Two-Wire pH to 4-20mA Converter/Isolator
Function:
The TWI-PH1 is an isolated two wire pH transmitter in a small, easy to install package. It has easily
accessible screw terminals and is built in a rugged housing. A standard BNC connector allows direct
plug-in of the pH probe.
The TWI-PH1 consists of a pH signal conditioner complete with temperature compensation and an isolator.
The temperature compensation is accomplished by means of a 3 KOhm thermistor. The isolated output prevents
interaction between output signals if more than one pH transmitter is used in a system.
Specifications:
Isolation: Input to Output to Power 800 VAC (test)
Operating Power (from Output Loop): 12-60 VDC
Output: 4-20 mA
Range: 0-14 pH
Accuracy/Linearity:+/- 0.01 pH
Operating Temperature: -20 Deg.C. to +50 Deg.C.
Temperature Compensation: 3KOhm Thermistor
pH Probe Connector: BNC
Line Effects: 0.03% per 10 VDC Line Change (calibrated for 24 VDC)
