moisture.IQ User’s Manual 21
Chapter 1. Installation
1.9.4 Connecting the Delta F Oxygen Cell
The Delta F Oxygen Cell is available in a general-purpose model with standard or VCR
®
fittings. The oxygen cell
can also be mounted in a weatherproof enclosure (R4) for outdoor applications or an explosion-proof enclosure
(R7) for use in hazardous areas.
Each Delta F Oxygen Cell has a set of sensor electrodes and a set of secondary electrodes. For proper operation,
make connections to each set of electrodes using a six-wire shielded cable. BHGE provides the 704-1357-B-Z
cable with 22 AWG conductors for use with Delta F Oxygen cells.
Note: Cable with 16 AWG conductors is the largest cable size that can be easily installed into the moisture.IQ
terminal blocks and the Delta F sensor terminal posts.
Cable error is a function of cable resistance/foot, length of cable, and maximum sensor current output. Since
higher range sensors have a greater current output, they have shorter acceptable cable lengths. Larger gauge
cable results in longer acceptable cable lengths. Use Table 1 below to determine acceptable installation
lengths for your application.
CAUTION! Do not power up the moisture.IQ without first establishing a gas flow through the Delta F
Oxygen Cell (see “Establishing a Gas Flow Through the Oxygen Cell” on page 26).
Table 1: Acceptable Cable Lengths for Delta F Ranges
Delta F Sensor Range Cable Gauge Max Length
0-50 ppm and 0-100 ppm 22 AWG 1300 ft
0-1000 ppm 22 AWG 400 ft
0-10,000 ppm and greater 22 AWG 100 ft
0-50 ppm and 0-100 ppm 20 AWG 2100 ft
0-1000 ppm 20 AWG 630 ft
0-10,000 ppm and greater 20 AWG 160 ft
0-50 ppm and 0-100 ppm 18 AWG 3300 ft
0-1000 ppm 18 AWG 1000 ft
0-10,000 ppm and greater 18 AWG 250 ft
0-50 ppm and 0-100 ppm 16 AWG 6600 ft
0-1000 ppm 16 AWG 2000 ft
0-10,000 ppm and greater 16 AWG 500 ft
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