IN-E-HyFlex-V4_10
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
Instruction Manual
Document Type
HygroFlex transmitter version 4: instruction
manual
Document title
Page
47
of 61
© 2006; Rotronic AG IN-E-HyFlex-V2_10.doc
Dimensions in mm
13 Probe calibration basics
Depending on whether or not the transmitter has a display and keypad, the following choices are
available to calibrate the probe(s) used with the HygroFlex:
a) Calibration using the transmitter display and keypad (see Functions)
b) Calibration using a HygroPalm indicator (see Remote Control with the HygroPalm indicator)
c) Calibration using a PC with the optional HW4 software (see separate software instructions).
This choice is available only with the HygroFlex 2 and HygroFlex 3.
d) Calibration of the probe alone (removed from the transmitter), using a PC with the optional HW3
software and the
T7-03-WIN
calibration cable (see separate software instructions).
Note: the HygroFlex itself should not require any field calibration.
13.1 Temperature calibration
Note: the stability of the Pt100 RTD sensor used to measure temperature is such that
temperature calibration in the field is seldom required.
In order to be able to correctly evaluate the accuracy of the temperature measurements
provided by the probe, you should be able to meet the following requirements:
a) Both the probe and a reference thermometer should be ventilated with the same stream of
air. Any dust filter used to protect the sensors should be carefully removed from the probe.
If the probe has a protective slotted cap, this may be left on the probe.
b) Air velocity at the sensor should be within the limits of 200 to 500 feet/minute (1 to 2.5
meters/second). Any comparison between two instruments at a velocity under 200
feet/minute may not be valid. Air velocity above 500 feet/minute may damage the
unprotected humidity sensor.
