TDS Mini Controller - BL983319

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The BL983319 is a compact, panel-mounted, process controller for measuring total dissolved solids (TDS) in a process stream that is within the 0 to 1999 ppm (mg/L) range. The device features a large LCD with protective cover. Users may choose from automatic or manual dosing modes. When in automatic mode the dry contact relay is activated when a reading is below the set point. The relay can be used to supply power to a dosing pump to add fertilizer to a nutrient solution in order to maintain an ideal concentration.
*The BL983319 uses a 0.65 conversion factor in which 100 μS/cm = 65 ppm.
  • Multicolor LED Indicator
  • Fire Retardant Casing
  • Fire Retardant Casing

Adjustable Dry Contact Dosing Relay

The BL983319 features a dosing relay that is activated when the reading is below a user programmable set point.

Programmable Overdose Protection

For enhanced safety the mini controller can be programmed to deactivate the dosing relay if the set point is not reached within a specified time interval. The overdosing timer is programmable from 5 to 30 minutes or disabled.

Relay Control Override

With the flick of a switch the mini controller's relay can be disabled (Off), placed in control (Auto), or be activated for manual operation (On) which is useful for priming a dosing pump.

Multicolor LED Indicator

Multicolor LED indicator allows an operator to quickly check the status of the controller.

  • Green = Meter in measurement mode and reading is below the set point.
  • Orange/Yellow = Reading is above the set point and the relay is activated.
  • Blinking Red = Indicates an alarm condition such as when the maximum dosing time has been exceeded.


Fuse Protected Dosing Contacts

The relay dosing contact is rated for up to a 2A load and is fuse protected.

Labeled Termination Connections

Quick-connect terminal blocks are clearly labeled for easy connection to power, conductivity probe and relay that can be used to operate a dosing pump, valve, audible alarm, or light. 


/2" NPT Male Threaded Amperometric Probe for Mounting In-line*

The BL983319 mini controller uses the HI7634-00 conductivity probe that is available with different cable lengths.

*HI7634-00 is not included and must be ordered separately





TDS Range

0 to 1999 ppm (mg/L)


1  mg/L ppm (mg/L)


±2% full scale

TDS Conversion

Factor 0.65


manual, with CAL trimmer

Dosing Relay

maximum 2A (fuse protected), 250 VAC, 30 VDC

Dosing Selection

contact closed when measure < setpoint


adjustable from 0 to 1999 ppm (mg/L)


adjustable, typically from 5 to approximately 30 minutes

Temperature Compensation

automatic from 5 to 50°C (41 to 122°F) with beta =2%/ºC

Power Supply

models “-0”: 12 VDC adapter (included) models “-1”: 115/230 VAC; 50/60Hz


83 x 53 x 99 mm (3.3 x 2.1 x 3.9’’)


models “-0”: 200 g (7.1 oz.) models “-1”: 300 g (10.6 oz.)

Ordering information

BL983319-1 (115/230 VAC) and BL983319-0 (12 VDC) are supplied with mounting brackets, transparent cover and instruction manual.

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