36 DF-150E Options
7.14.4 Temperature Control in R4/R7 Enclosures
R4 and R7 enclosures may be supplied with the temperature control option.
Typically this option is installed in an effort to minimize diurnal changes in
outdoor installations, or when the sensor must be kept at an elevated
temperature in order to minimize condensation.
NOTE: The customer must supply the electrical power (110VAC or 220VAC)
for this option.
For most applications, the sensor and electronics are maintained at a
temperature of 65-70 degrees F. The temperature controller, located in the R4
or R7 enclosure, is set at the factory and typically requires no adjustment
unless components are changed or application conditions require higher
temperatures. In the event that the enclosure temperature must be adjusted,
follow the steps below.
1) Obtain a temperature measurement device capable of measuring the
desired operating temperature to an accuracy of +/- 2 degrees F.
2) Open the R4 door or remove the R7 cover. Attach the temperature
measuring probe to the side of the oxygen sensor. Be sure to cover the
enclosure opening to prevent cooling.
3) Turn on the analyzer and heater. Allow at least four hours for the
enclosure temperature to stabilize.
4) Locate the temperature control potentiometer on the circuit board in
the enclosure above the terminal strip. See Figure 23 Turn it clockwise to
increase the temperature and counter-clockwise to decrease it. After each
adjustment re-cover the enclosure and allow at least an hour for it to stabilize
at the new temperature.
Figure 23: NEMA 7 Enclosure Temperature Control
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