™CompleteSense Controller w/ separate Temperature Controller:

Temperature sensing and Level control circuitry are incorporated into the probe, and a separate Electronic Temperature controller, is added for water temperature control and monitoring. This method controls the basin heater with a 3 wire PT100 RTD (Built into the probe) and a 1/16 Din temperature controller. This version is a more expensive version than the standard, but can monitor exact basin water temperatures, and allows for adjustments of temperature settings.

  • Each Panel can be enclosed in your choice of NEMA 4 ANSI 61 painted cold rolled steel, NEMA 4X stainless steel or our standard NEMA 4X non-metallic enclosure.
  • Each choice of enclosure will have a hinged door.
  • M-Tech CompleteSense sensor/probe with optional Pt100 RTD. 30-foot jacketed cable is standard. Other lengths are available as options.
  • Built in level control with programmable time delay for slosh dampening. RS-485 comm port.
  • Temperature controller mounted inside the control panel (standard) or can be mounted on the door and maintain a NEMA 4/4X rating depending on the selected enclosure. (option)
  • Available in single, dual, and triplex contactor arrangements. (Up to (2) Heaters per contactor maximum)
  • Fused Disconnect (standard), or Circuit breaker available.
  • 5K interruption capacity is standard, other ratings available.
  • External disconnect handle with padlock provisions to meet lockout tag-out safety requirements.
  • Control circuit transformer with primary and secondary circuit breaker protection
  • 120VAC control voltage standard
  • Field terminations included for the following:
    • Spray water circulating pump
    • Heater/Level Probe.
    • RTD wires for temperature controller
    • Freezing water low temperature alarm set at 35 Deg. F
  • On/Off selector switch mounted on the door (1 per contactor)
  • Heater Power On Pilot light mounted on the door (1 per contactor)
  • Low water cut out protection for the heater element
  • Each panel is certified UL508A/cUL508A. Available with UL698A certification (Intrinsic Safety)

Custom Control panels, including optional spray pump starters and/or fan motor starters, are available. Please contact us with your specific needs.


  • Basin Heater Failure Circuitry – includes a press to test push button, current sensor, delay timer, heater fail pilot light, contacts to test the heater remotely, heater failure normally open contacts wire to field terminals.
  • Alarm horn
  • Alarm Beacon
  • Basin Heater “run” normally open contact wired to terminal blocks

Custom Control panels, including optional spray pump starters and/or fan motor starters, are available. Please contact us with your specific needs.

M-Tech Chill Products – ™CompleteSense Probe Temperature Switch Controller with Built in Water Level Sensing


  • Temperature Sensor Level Switch/Controller with built-in level sensing
  • All electronics potted in the fitting
  • Dry contact for temperature outputs
  • Temperature Set-point and reset-point programmable
  • Programmable time delay for slosh damping
  • Level sensing is conductivity type detected at a tip of the probe
  • All stainless 316 construction with PTFE isolator
  • All wetted surfaces approved with potable water
  • Standard fittings ½” and ¾” NPT male, others available
  • PTFE and PVC jacketed cables available
  • Optional connector on sensor fitting available instead of cable
  • RTD 3-wire PT100 Ohm output to temperature controller


™CompleteSense is an electronic controller with combined Temperature sensor & Level control in a single probe. The primary application is low temperature and low liquid level cutoff protection in cooling tower basins. Temperature and level measurements are detected at the tip of the stainless-steel probe.


™CompleteSense monitors the temperature in the cold water basin of a cooling tower and provides on and off operation of the basin heater element. The set-point is typically programmed at 42OF with an operating band width of 5OF. The adjustable set-point range is from -40 to 176OF   (-40 to 80OC). When the temperature drops to 40OF, the probe energizes the power contactor(s) energizing the basin heater element. The ™CompleteSense de-energizes the power contactor at 45OF. An alarm contact closes when the temperature in the cold water basin is 35 OF or less.


The low water cutout circuit will not allow the heater to energize unless the sensor is submerged in water. The sensor should be located at least one inch higher than the heater element assuring the heater element is covered with water before energizing. (see Basin Heater location PDF below) 3-wire PT100 Ohm RTD output is used for temperature monitoring and control of water in basin

The Heater current charts may assist in selecting the proper contactor arrangement. If you are unsure of the correct sizing, we can assist in the selection.

Note on incoming power wiring:

Calculate the amperage as follows:The main incoming power wire requirements are sized based on the total heater nameplate kW and voltage. Calculate the actual load on the heater contactor control panel (the total kW of all the heaters connected to it) or use the nameplate rating in determining the wire size required.

Single Phase Amperage = Total kW x 1000



Three Phase Amperage = Total kW x 1000    

                                           Voltage x 1.732


The field supplied branch circuit disconnect switch and the branch circuit protective devices (fusing or circuit breaker) should be sized to carry at least 125% of the current calculated above.


When calculating a properly sized control panel, we assume there is going to be a maximum of (2) Heaters wired to a single contactor. Our prices are based on this assumption. There is (1) selector switch and (1) pilot light per contactor.

We can modify our standard control panels for you. Let us know your requirements.

CompleteSense Controller W Separate Temperature Controller



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