Figure 18 Dew-Point Transmitter Pin Assignment Drawing - Michell Instruments Liquidew I.S. User Manual

INSTALLATION
c. Ensure that the outer diameter of the selected cable is matched to an
EExe M20 cable gland (5). Unscrew the cable gland (5) and slide the cable
through the cable gland (5) and into the terminal housing (1) through the
cable entry (3).
d. Remove the terminal block (4) from the PCB for easier operation. Connect
the signal cable leads with the crimps/wire ferrules to the screw terminals
on the terminal block (4) in accordance with the following pin-assignment
drawing.
e. Press the terminal block (4) back into its socket fi rmly.
f. Tighten the cable gland (5) around the cable. Ensure that the sealing is
not damaged and that the cable gland and seals are assembled correctly
in order to ensure ingress protection.
g. Install and tighten the terminal housing lid (2).
26
HAZARDOUS AREA
NOTE: Connect cable screen to cable gland
Figure 18 Dew-Point Transmitter Pin Assignment Drawing
Always connect the 4-20 mA return signal to a suitable load
(in this case, back into the control unit) before the power
is applied. Without this connection the transmitter may be
damaged if allowed to operate for prolonged periods. The
maximum load is 500 Ω at 24 V or 250 Ω at 12 V.
When the crimps/wire ferrules are installed into the connector
terminal block ensure that they are inserted completely.
When all wire connections are made, ensure that there is a
minimum clearance distance of 2mm (0.008") between each
Liquidew I.S. User's Manual
SENSOR INPUTS Block
Dew Point Temp
12 V Min, 28 V max
+ 4-20mA lead
- 4-20mA lead
4-20mA
terminal.
97092 Issue 5.1, October 2018