Transmitter Installation
Page 27
August 2019
DPP-UM-00256-EN-03
Control Oelay Output Module
Two independent SPDT (single-pole, double-throw, Form C) relays are contained in this module The relay operations are user
configured via the front panel to act in either a flow rate alarm, error alarm or totalizing pulse The relays are rated for 200V AC
maximum and have a current rating of 0 5 A resistive load (175V DC @ 0 25 A resistive) Use a secondary relay whenever the
Control Relay ISO-MOD is used to control inductive loads such as solenoids and motors
Typical relay connections are illustrated in
The reed relays located within the relay module can interface directly
with small pilot lights, PLCs, electronic counters and SCADA systems
shows the connection of an external power relay to the Relay ISO-MOD Use external power relays whenever the
load to be switched exceeds the switch rating of the reed relays, or if the load is inductive in nature
b NO
b CM
b NC
a NO
a CM
a NC
I/O: RE L AY
P.N. D020-1045-102
ISO
-MOD
INTERNAL
CURCUIT
FLOW OK
LOW FLOW
EXTERNAL
TOTALIZER/SAMPLER
P
Figure 24: Typical relay connections
b NO
b CM
b NC
a NO
a CM
a NC
I/O: RELAY
P.N. D020-1045-102
ISO-MOD
POWER
RELAY
POWER
SOURCE
Figure 25: External relay connections
