Perfect for use in HVAC, greenhouses, food aging facilities, printing plants, computer rooms and anywhere humidity is an important factor. The HI 9166L includes an LCD display that shows the R.H. percentage as it is being transmitted. This is valuable for applications where the operator must know the humidity level at all times. The HI 8614 is a water-resistant pH transmitter 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 controllers HI 8510, HI 8710 or HI 8711, recorders, computers or any data monitoring device that accepts 4 to 20 mA input. HI 8614L allows easy verification and monitoring of measured values, and is easier to calibrate and maintain. These instruments are particularly useful in industrial conditions where electrical interference is an important factor. By galvanically isolating the signals, any interference created is prevented from reaching the transmitter.