10
ZM400 Series Indicators Service Manual
1
General information and warnings
1.2 Installation
1.2.1 Torque specifications
There are four sizes of strain reliefs exiting the indicator: PG11, PG7, PG13.5 and NPT
3/4”. The torque specifications for the locknuts which hold the strain reliefs to the
indicator housing and the specs for the dome nuts which seal the cable that passes
through the strain relief are shown in the table below.
1.2.2 Proper grounding of cables
On the stainless steel desktop models, cable shield wires should be grounded directly
to the studs provided at the bottom of the enclosure, close to the strain relief entry point,
with wire lengths at a minimum. On the aluminum and panel mount models the shield
wires should be connected to the SHLD connection on the corresponding terminal
block connectors.
NO USER SERVICEABLE PARTS. REFER TO QUALIFIED SERVICE
PERSONNEL FOR SERVICE.
CAUTION: The acorn nuts holding the back plate of the indicator in place must
each be tightened, in multiple passes, in the following pattern to a final torque
of 0.68 N-m (approximately 6 in-lbs) to ensure proper gasket sealing.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Indicator back
plate
3/4” NPT
Strain Relief
PG13.5 Strain
Relief
PG11 Strain
Relief
PG7 Strain
Relief
Dome Nut
66.4 lb-in
7.5 N-m
33.2 lb-in
3.75 N-m
33.2 lb-in
3.75 N-m
22.1 lb-in
2.5 N-m
Lock Nut
44.2 lb-in
5 N-m
22.1 lb-in
2.5 N-m
22.1 lb-in
2.5 N-m
14.4 lb-in
1.62 N-m
