MIOX RIO Series Operators Manual
P/N: 102-00076-G Page 23
Hydrogen/Hardness Connections
The Hydrogen/Hardness connector provides field connection points for an external hydrogen
monitor and/or an external hardness monitor. The hydrogen monitor inputs require both
normally closed and normally open dry contacts. The hardness monitor input only requires
normally closed dry contacts. Table 6 provides the description for each terminal.
Table 6 Hydrogen/Hardness Connector Name and Description
Connection Name
Description
H2NO1
Normally open input; OPEN = OK,
CLOSED =
FAIL (Safety Relay)
H2NO2
Normally open input; OPEN = OK,
CLOSED =
FAIL (Safety Relay)
H2NC1
Normally closed input; CLOSED = OK,
OPEN
=
FAIL (Safety Relay)
H2NC2
Normally closed input; CLOSED = OK,
OPEN
=
FAIL (Safety Relay)
HM1
Hardness monitor input; 24VDC = OK,
0 VDC =
FAIL
HM2
+24VDC source of hardness monitor input
Figure 13 H
2
/Hardness Connector
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