ORP Mini Controllers

SKU : d1a28b5ecce7

The BL932700 is a compact,ORP process controller designed for applications where space or cost is important. The device may be used with any ORP electrode with a standard BNC connector. It’s adjustable dosing relay may be configured to dose above or below a user programmable mV setpoint. Users may choose from automatic or manual dosing modes allowing for easy maintenance and troubleshooting.

  • Large Clear LCD
  • Fire Retardant Casing
  • BNC Connection
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Adjustable Dosing Relay

The BL932700 features a dosing relay which may be configured to dose above or below a user programmable mV setpoint.

Selectable Overdose Protection

The mini controller may be programmed to deactivate a valve, pump, or connected device if its activation continues over a selected time; adjustable from 5 to 30 minutes.

Selectable Control Override

With the flick of a switch, normal “Auto” operation may be overridden turning your connected device “Off” from operation or always “On.”


Analog Output Communication

The BL932700 features a 4 – 20 mA analog output for connection to a data logger, chart recorder, or other device.

External Disabling Feature

A normally open contact may connect to a level controller or flow monitor. This safety feature may be used to prevent continuous dosing in the event of specific or undesired system conditions.

Matching Pin Connection

An included matching pin option helps protect the sensor from ground loop effects that may lead to erratic readings or system damage.




Front View

Installation cut-out dimensions are provided as well as outside panel dimensions.

Side View

Adjustable location brackets allow the controller to slide easily and securely into place.




Specification NameDetail
ORP Range±1000 mV
ORP Resolution1 mV
ORP Accuracy (@25°C/77°F)±5 mV
Calibrationmanual, with CAL trimmer
Dosing Relaymaximum 2A (fuse protected), 250 Vac, 30 VDC
Dosing Selectionreducing or oxidizing, selectable on the back panelcontact open=reductant dosage=relay ON if measure > setpointcontact closed=oxidant dosage=relay ON if measure < setpoint
Setpointadjustable from -1000 to 1000 mV
Overtimeadjustable, typically from 5 to approximately 30 minutes
Recorder Output4 to 20 mA, accuracy ±0.20 mA, 500 ? maximum load
Input Impedance 10^12 Ohm
Power SupplyBL932700-0: 12 VDC adapter (included);BL932700-1: 115/230 VAC; 50/60Hz
Dimensions83 x 53 x 99 mm (3.3 x 2.1 x 3.9’’)
WeightBL932700-0: 200 g (7.1 oz.)BL932700-1: 300 g (10.6 oz.)
Ordering InformationSupplied with mounting brackets, transparent cover and instruction manual.
Recommended ProbeHI2001 PVDF body ORPelectrode with 1/2” NPT thread, BNC connector and 3 m (9.8’) cable for continuous flow-thru monitoring (not included).