The water-resistant pH Transmitters with 4-20 mA is designed with a high-impedance input to accept signals directly
from a pH electrode. The signal is then processed by a special high-impedance amplifier, which transmits an output current directly proportional to the input signal but independent of changes in load or cable capacitance. Calibration is performed by adjustment of two independent trimmers for slope and offset.
Temperature compensation is performed by the transmitter’s ATC circuitry when measurements are taken with a temperature probe attached, it is also possible to substitute a fixed resistor for the temperature probe, if ATC is not required. The transmitter can be connected to Hanna controller recorders, computers or any data monitoring device that accepts 4 to 20 mA input.
Four versions are available. The standard models with an LCD, which allows easy verification and monitoring of measured values, and is easier to calibrate and maintain.
It is supplied with instructions.(**Add L to end of Product Code for model with LCD)
Range 0.00 to 14.00 pH / 4 to 20 mA, -2.00 to 16.00 pH / 4-20 mA
Resolution 0.01 mA / 0.01 pH
Accuracy ±0.02 mA / ±0.02 pH
Calibration Offset: ±2.2 mA / ±2 pH; slope: ±0.5 mA / 86 to 116%
Temperature Compensation Fixed or Automatic from 0 to 100° C (32 to 212° F) with HI 76608 probe
Input Impedance 1012 Ohm
Output 4-20 mA (isolated)
Temperature Probe HI 76608
Protection IP 65
Power Supply 18-30 VDC
Load Max 500 Ohm
Environment 0 to 50° C (32 to 122° F); RH max 95% non-condensing
Dimensions 165 x 110 x 90 mm (6.5 x 4.3 x 3.5″)
Weight 1 kg (2.2 lb.)