Multiparameter Digital pH, ORP, Temperature Probe

Potential matching pin This probe also incorporates a potential matching pin. The matching pin is considered the "earth groundin. connection and is used to prevent ground loop effects from causing erratic readings and damage to the system. Specialized pH glass The pH glass has been chosen to produce stable quick equilibration even in low conductivity waters. Additionally, the pH sensor is designed to produce a mV value near pH 4 (not pH 7 like typical pH sensors) should it stop working. A broken pH electrode that produces a mV value near pH 7 would produce an alarm state and disable any pump activated. ORP The ORP sensing surface is a large smooth surfaced platinum band that encircles the circumference of the temperature probe. It is referenced to Ag/AgCl reference electrode (3.5M KCl). Differential measurement technique The ORP and pH sensors and reference electrode use a differential measurement technique which is known to stay in service and provide accurate measurements under adverse conditions that may cause conventional pH probes to produce erroneous measurements. With the differential technique, a ground loop current will flow through the low impedance path of the matching pin thus providing immunity to the measurement signals Digital signal The probe converts these measurements to a digital signal to eliminate noise and static due to high impedance signals carried by cable DIN Connector Multi-pin sensor connector is manufacturer specific and allows for easy connection to the compatible meter.