Hach Sigma 1600, Instrument Manual

Page: 15 / 50

Section 2
Page 15
6507installation.fm
Electrical Connections
2.4 Electrical Connections
DANGER
Connect voltages 30 Vrms (60 V
dc) only in the low voltage
junction box. 110 Volts or greater
connections must be made in the
high voltage terminal box.
All power and external input signal connections are in two 4-inch
junction boxes located on the rear exterior of the sampler. All AC
connections are made in the box labeled “High Voltage”. The low
voltage connections are made in the other box. Within the high voltage
junction box (see
Table 1 ), wires going to the control panel and the
compressor are both wired directly to the incoming power line, which
must be powered by a dedicated circuit with a 15 amp (minimum)
breaker in conduit. Wiring connections for the optional pump control
are also made in the high voltage junction box, via a second conduit.
If optional 4–20 mA or contact closure connections are made in the low
voltage junction box, use a separate conduit (see
Table 2 ).
Table 1 High Voltage Junction Box Connections
Power or Control Wire Wire and Connectors
120 V 60 Hz White (neutral), Black (live), Green (ground)—two sets
Pump Control Timer (optional)
Gray jacketed cable with green band. One red and one black 18-gauge conductor.
Rated 1A at 125 VAC.
Table 2 High Voltage Junction Box Connections
Signal Wire Wire and Connectors
Contact Closure
2-conductor gray jacketed cables with red and black connector. The polarity is not
important. The contact closure signal must be a dry contact closure.
4–20 mA (optional)
2-conductor gray jacketed and shielded cable. Black (negative), Clear (positive).
Note: Although the 4–20 mA is optional, the 4–20 mA wires are present in the
junction box.