Electro-Chemical Devices (ECD) SMS22 - Manual (Page 14)

2.2 WIRING
All adjustments and maintenance on electrical devices should be made by qualified
personnel in accordance with national or local regulations.
No Service should be carried out on the instrument without first switching off the power.
Electrical wiring should only be conducted by qualified personnel. See the wiring color code for the SMS-
22 in Section 8.2 below.
2.2.1 Wiring, Sensor(s)
The MVS10 Sulfide Sensor and the PHS10 pH Sensor were connected to the C-22 analyzer at the factory,
no additional connections are necessary. Color coded connections for these sensors are shown in the
wiring diagrams in Section 8.2 or on the inside cover of the C22 analyzer.
2.2.2 Wiring, power
Attach power cable as shown in the diagram in Section 8.2. Feed the cable through the gland fitting on
the right hand side of the SMS-22. Tighten the cable gland to provide a good seal to the cable.
2.2.3 Wiring, 4-20 mA Outputs
Connections to the DCS or PLC should be made with 22 gauge, twisted pair communication cable. The
standard configuration has Total Sulfide on mA 1 and pH on mA 2. The 4-20 mA outputs are powered
outputs. Attach the output cables as shown in the diagram in Section 8.2. Feed the cables through the
gland fitting on the right hand side of the SMS-22. Tighten the cable gland to provide a good seal to the
cables.
2.2.4 Wiring, Contact Relay Outputs
The standard configuration has four SPDT 230V 5 A relays that are wired to the drain solenoid and the
various reagent and sample pumps. There are no alarm relays available on the SMS-22.
SMS-22 Page 5