TDS Controller (0 to 999 ppm) - BL983329

In stock
The BL983329 is a compact, panel mounted, process controller for measuring total dissolved solids (TDS) in a process stream that is within the 0 to 999 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 above the set point. The relay can be used to supply power to a dosing pump or a solenoid connected to a valve. *The BL983329 uses a 0.5 conversion factor in which 100 μS/cm = 50 ppm.
  • Multicolor LED Indicator
  • Fire Retardant Casing
  • Fire Retardant Casing


Adjustable Dry Contact Dosing Relay

The BL983329 features a dosing relay that is activated when the reading is above 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. 





TDS Range

0 to 999 ppm (mg/L)


1 mg/L ppm (mg/L)


±2% full scale

TDS conversion Factor



manual, with CAL trimmer

Dosing Relay

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

Dosing Selection relay

activated (contact closed) when the measurement reading is greater than the setpoint


adjustable from 0 to 999 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

BL983329-1 (115/230 VAC) and BL983329-0 (12 VDC) are supplied with mounting brackets, transparent cover and instruction manual.