BL932700 ORP Mini Controller with Analog Output

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BL932700 ORP Mini Controller with Analog Output


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

A large LCD clearly displays the parameter you are monitoring.

Fire Retardant Casing

Special materials provide additional protection in the event of an emergency.

BNC Connection

The controller features a BNC connector that allows any ORP probe with a BNC connector to be used.



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..

Range ±1000 mV
Resolution 1 mV
Accuracy (@25°C/77°F) ±5 mV
Calibration manual, with CAL trimmer
Dosing Relay maximum 2A (fuse protected), 250 Vac, 30 VDC
Dosing Selection reducing or oxidizing, selectable on the back panel
contact open=reductant dosage=relay ON if measurement > setpoint
contact closed=oxidant dosage=relay ON if measurement < setpoint
Setpoint adjustable from -1000 to 1000 mV
Overtime adjustable, typically from 5 to approximately 30 minutes
Input Impedance 10¹² Ohm
Analog Output 4 to 20 mA, accuracy ±0.20 mA, 500 Ω maximum load
Power Supply BL932700-0: 12 VDC adapter (included);
BL932700-1: 115/230 VAC; 50/60Hz
Dimensions 83 x 53 x 99 mm (3.3 x 2.1 x 3.9’’)
Weight BL932700-0: 200 g (7.1 oz.)
BL932700-1: 300 g (10.6 oz.)
Ordering Information BL932700-0 (12 VDC) and BL932700-1 ( 115/230V) are supplied with mounting brackets, transparent cover and instruction manual.