Kernco Instruments Co.

the model 3679N
Enclosed in a standard 1/4-DIN watertight housing, the model 3679N features two on/off relays for pH or ORP, automatic-temperature-compensated (ATC) pH readings, and a shorting plug selectable to pH or ORP. It also has selectable hysteresis settings for customized control and isolated 4–20-mA current output that can be used as a proportional output. The operating ranges are 0.00–14.00 for pH (with an accuracy of ±0.03 pH units) and –1,999 to +1,999 mV for ORP (with an accuracy of ±0.1% full scale).