The Watlow 935A is a 1/32 DIN size digital temperature controller. Click
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).