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Liquidew I.S. User Manual
Michell Instruments 19
INSTALLATION
Alarm 3 (connection labelled as AL3) and Alarm 4 (connection labelled as AL4) are Form
A (single pole, single throw, normally open) relays.
The method of connection is as follows:

NO COM
a. Strip back the wires of the Alarm 3 cable, exposing approximately
6mm (0.2”) - the use of crimps/wire ferrules is recommended.
b. Insert the N/O connection lead into the AL3

NO terminal way
on the terminal block and tighten the screw.
c. Insert the common lead into the AL3

COM terminal way on the terminal
block and tighten the screw.
d. Repeat operations a. to c. for connecting the Alarm 4 cable to the AL4
terminals.
e. Check that the wiring has been completed correctly.
f. Push the terminal block firmly back into the
ALARMS
socket.
2.4.2.5 RS485 Port Connection
The RS485 connection is a push-fit 9-pin socket , as shown in Figure 8.
The method of connection is as follows:
Pin Number Function
2 B
3 A
5 0 V
a. Check the orientation of the RS485 connector and gently push it into the
socket.
b. Tighten the two screws on the connector.