2
2. INSTALLATION
2.1 Preliminary Tests
Upon receipt of the instrument, the gauge should be checked for proper operation (including the
thermistor). In position "B" the gauge will read between 2000 and 8000 digits (see Section 3 for
readout instructions). When pulling slightly on the end flanges (items number three and four in
Figure 2), the reading should increase.
Checks of electrical continuity can also be made using an ohmmeter. Resistance between the
gauge leads should be approximately 180
Ω
, ±10
Ω
. Remember to add cable resistance when
checking. (22 AWG stranded copper leads have a resistance of approximately 14.7
Ω
per 1000
feet or 48.5
Ω
per kilometer. Multiply these factors by two to account for both directions.)
Resistance between the green and white conductors should be approximately 3000 ohms at 25 °C
(see Table 6 in Appendix B for other temperatures), and between any conductor and the shield
should exceed two megohms.
2.2 Sensor assembly
Figure 2 - 4435 Print