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 35 of 61
© 2006; Rotronic AG IN-E-HyFlex-V2_10.doc
Selections
The Adjust M.PT function offers the following selections:
RHS: Humidity calibration using the ROTRONIC Humidity Standards
1)
Humidity: Humidity calibration using any suitable reference environment
Temperature: Temperature calibration using any suitable reference environment
1) For humidity calibration, ROTRONIC offers convenient, certified humidity standards to generate known
humidity values (for more details, see Appendix 3 - Humidity Calibration).
Procedure
When two probes are connected to the transmitter, be sure to select (display) the HygroClip probe
to be calibrated prior to entering the function.
When using the Adjust M.PT function, it is important to observe the following rules:
a) Always calibrate temperature first (if temperature needs to be calibrated)
b) When calibrating temperature (2 points), always calibrate at the low value first. The instrument is
programmed to use the low temperature value to compute the offset and the high temperature
value to compute the gain.
T-low < 40 °C (104°F) : used to compute the calibration offset
T-high ≥ 40 °C (104 °F) : used to compute the calibration gain
For best accuracy, we recommend using a T-low value close to 20°C (68°F).
c) When calibrating relative humidity (2, 3 or 4 points) with the ROTRONIC humidity standards,
always follow the sequence 35 %RH, 80 %RH, 10 %RH or 5 %RH, 0 %RH. When using a
reference other than the ROTRONIC humidity standards, use reference conditions that are
within the following brackets and observe the sequence:
>25 %RH…≤55 %RH
1)
: used to compute the calibration offset
>55 %RH
1)
: used to compute the calibration gain
>1 %RH…≤25 %RH : sensor linearity adjustment
≤ 1 %RH : sensor linearity adjustment
The HygroFlex is programmed to automatically recognize these brackets.
1) For best accuracy, we recommend using values close to 35 %RH and 80 %RH
When the probe is at equilibrium with the reference environment, activate the Adjust M.PT function
and make the appropriate selections:
a) RHS: press the ENTER key to select this item. The LC display shows the value read by the
probe at the time the ENTER key was pressed. The letters “RHS” are displayed on the message
line. Use the UP or the DOWN key to change the humidity value to match the mean value (at
23°C) written on the certificate supplied with the standard. For a faster change, keep the key
pressed down. Press the ENTER key when done.
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