Enclosure 6N Temperature switches
Page 6
CHAPTER
3
ADJUSTMENTS AFTER INSTALLATION
The factory-set setpoint or adjustable setpoint range is marked on the nameplate of the
switch. This section describes the adjustments needed after an Adjustable Temperature
switch has been properly installed.
SETPOINT ADJUSTMENT
Disconnect the electrical power. Check for multiple circuits.
1.
Loosen the screws on the housing cover, and move it aside.
2.
Check the setpoints per paragraphs 4 and 5 below for precise adjustments.
3.
The adjustment nut can be rotated by hand or with an open-end wrench or similar tool. The
range scale indicates the increasing setpoint and is intended to be used only as an approximate
guide. Make precise final adjustments using the measurements described in para
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and 5 below.
4.
To check the increasing setpoint of a temperature switch, insert the temperature probe
into a fluid bath so that the hex is within 3/8 inch (9.5 mm) of the surface, and also
insert a calibrated thermometer into the fluid next to the probe. Slowly increase the
temperature of the fluid (try not to exceed 5 °C or 9 °F per minute) until actuation is
noted by listening to the audible snap of the Belleville spring, or with an ohmmeter
across the appropriate terminals in the terminal block.
5.
If you want to check the decreasing setpoint, slowly decrease the temperature after the switch
has actuated and note the value at which the audible snap or an ohmmeter indicates
deactuation. Deadband may be calculated if desired by subtracting the decreasing setpoint
reading from the increasing setpoint reading.
CAUTION
6. Replace the cover by moving it back into position over the top of the housing and
tightening the screws until the cover is snug against its gasket. Do not overtighten, as
this could damage the gasket.