DMS-R-IM
Preventive Maintenance
April 7, 2021
Digital Modular System - Rinse
6-24
6.14
PM for Temperature Controller
(Thermostat)
Item
PM Activity/Schedule
Thermostat
Calibrate thermostat.
Q
(D–daily; W–weekly; M–monthly;, Q–quarterly; HY–half-yearly; Y–yearly; TBD–to be determine)
Figure 6-18: Thermostat
Step
Description
1
A.
Calibration:
OFF 150
/164
F with adj. stem 192
arc from OFF max. differential
12
F.
B.
Range Check:
OFF snap 85
/117
arc from OFF, bulb at 80
F.
2
310
3 arc dial travel.
3
Temperature range: OFF to 60
F to 250
F
4
Dial spread: 1.16
arc per
F.
5
All calibration and differential checks to be performed with bulb and
6.00” of capillary in an agitated liquid bath with 3
F per minute max.
rate of temperature bath change and thermostat terminals in vertical
position.
6
Mechanically actuated positive off contacts close at approximately 30
arc clockwise rotation of adj. stem from adj. stem reference position.
