Fluke Datapaq Food Tracker User Manual page 57

Sensor Cap
The humidity sensor is supplied as standard
with a metal cap (part no. PA20041) fitted
with a removable PTFE filter (PA2041).
The sensor filter is provided to protect the
sensor but may affect its responsiveness
during measurements; thus, if
responsiveness is important, the cap
without a filter should be used. However, if
there is any risk of contamination of the
sensor from by-products of the cook
process, the PTFE filter should be used.
The filter may need to be cleaned and
dried regularly; an ultrasonic bath is ideal
for this. If the filter becomes excessively
dirty it should be replaced.
Humidity Sensor in Use
Humidity measurement is not possible in processes where the sensor may be
submerged or subject to water showers, etc.
When resetting the logger (see p. 40), note that the humidity sensor is on
channel 9. As it records both humidity and temperature, the resultant paqfile
will have two sets of data for this single sensor: temperatures measured by the
humidity sensor will appear as channel 9, and humidity measurements as
channel 10.
Connection and Positioning
Connect the humidity sensor to the logger as follows.
1. Engage the male connector of the humidity connecting cable (PA2030) and
the female connector on the humidity-sensor cable (PA2020), and lock
together using the threaded connector.
2. On the logger, remove the blanking plug from humidity sensor socket
(marked '%RH') and insert the connection cable's plug into the socket.
The humidity sensor can be used only with non-submersible thermal barriers
TB5009, TB5010 and TB5011 (see p. 22). The electronics in the sensor should
be maintained below 85°C/185°F and are thus carried within the barrier in the
humidity probe retainer alongside the logger.
FOOD TR ACK ER
Components of the humidity sensor
cap (PA20041), showing the PTFE
filter (left, PA2041) and its
fixing screw.
Humidity Measurements
57