Honeywell Fema DCM-203-574 Series Assembly And Operating Instructions Manual page 54

1. Basic Equipment of the Pressure Switches
External thread Internal thread
Fig. 3. Pressure switch
External thread G ½"
(Pressure gauge connection)
When using flat seals, turn in the centering
screw (depth A approx. 0.3 – 0.5 mm)
Internal thread G ¼"
In gas applications, only internal thread up
to 4 bar permissible. Use flat gasket ring
for pressure > 4 bar.
14
Differential Pressure Switch
Pressure connection:
2 x G ¼'' internal thread.
Connect the high and the low pressure
according marks. Incorrect pressure
connections may lead to malfunctioning.
Fig. 4. Pressure connection
+ = High Pressure P
– = Low Pressure S
MU2B-0238GE51 R0616D