Watlow 935 Kits


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OUR ORIGINAL KIT
The Watlow 935A is a 1/32 DIN size digital temperature controller. Click here for detailed users' manual from Watlow.

This controller can be used on both 110V and 220V systems, both in the US and internationally. It is easily configured for either Fahrenheit or Celsius operation (we will set it up appropriately based on your location or preference).

In our view, the strengths of the 935 are:

  • Like all Watlow controllers, we can perform a recalibration prior to shipment. This assures the customer of accurate temperature readings.
  • The 935 responds very quickly to temperature changes.
  • It offers a very clean, uncluttered display that we think is very attractive.

The 935A has a single line display, on which is displayed the current thermocouple reading. Viewing the set point requires a single button press. Changing the set point requires pressing and holding the SET button, and then using the UP and DOWN arrow buttons to adjust the set point.

Aside from not simultaneously displaying current temperature and setpoint, the minor weakness we see in the 935 is closely associated with its fast temperature response. The 935 tends to allow the boiler temperature to oscillate a little more than other Watlow controllers when idling.

This has absolutely no effect on shot temperature (we have measured it to confirm), as the actual temperature oscillation is usually no more than +/- 0.5F (std deviation is actually 0.3F). But the displayed temperature on the 935 will generally not remain as "locked" on setpoint as our other Watlows (although the display variation is never more than +/- 1F).

STEAM CONTROL
Our 935 controllers have a second output (OT2). We use this second output, along with a special dual SSR, to implement effective ON/OFF steam mode boiler temperature control. Kits with the MLG steam control system are actually slightly simpler to install than a basic, brew temperature control only system. This is because:
  • Our steam control system does not require access to the Silvia's steam switch
  • We pre-wire the SSR before shipping.

The steam control system for the 935 kits is identical to that offered with our top-of-the-line SD3C kits. Please click here for additional information.



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