Table of Contents
Advertisement
5
Calibration / Adjustment
5.1
Definitions
Calibration
The calibration documents the accuracy of a measurement device. The device under test
(specimen) is compared with the reference and the deviations are documented in a calibration certifi-
cate. During the calibration, the specimen is not changed or improved in any way.
Adjustment
The adjustment improves the measurement accuracy of a device. The specimen is compared with the
reference and brought in line with it. An adjustment can be followed by a calibration which documents
the accuracy of the adjusted specimen.
For general calibration / adjustment guidelines and for the choice of humidity reference devices please
see "Calibration Instructions" at www.epluse.com/ee23
The 2-point adjustment is recommended for best accuracy over a wide RH and / or T range.
Always start the 2-point adjustment with the lower adjustment point RH_low / T_low, followed by the
higher adjustment point RH_high / T_high.
The span between the two adjustment points must be:
|RH_high – RH_low|
|T_high – T_low|
The 1-point adjustment should be used only when the RH and/or T range of interest is rather narrow.
The RH resp. T adjustment point should be ideally in the middle of the range of interest.
Example:
In a climate controlled environment with 40% < RH < 60% and 15 °C < T < 25 °C (59 °F < T < 77 °F),
1-point adjustment shall be performed at 50 % RH and 20 °C (68 °F).
1-point adjustment leads to very good accuracy within the range of main interest at the cost of the
accuracy beyond this range.
5.2
Adjustment of EE23 Model T1, T2, T4 and T6
via Push Buttons on the Electronics Board
5.2.1
2-Point RH Adjustment Procedure / T Adjustment Procedure
1. For a RH humidity adjustment set the jumper to CAL RH / for a temperature adjustment set the
jumper to CAL T.
First point adjustment
2. Allow for the probe to stabilize at RH_low / T_low for min. 30 minutes.
3. Press BUTTON S2 for min. 3 seconds to start the adjustment procedure for the first point. The LED
„D1" illuminates and „CAL<" appears on the LC display.
4. Press BUTTON S1 (up) and S2 (down) to adjust the measured value in steps of 0.1% / 0.1 °C up
or down to match the reference value. The change is indicated on the display (if available) or can be
measured at the analogue output.
5. Press BUTTON S1 for min. 3 seconds to store adjusted value and end the first point adjustment.
or
14
> 30% RH
> 30 °C (54°F)
Operating manual EE23 humidity / temperature sensor
Advertisement
Table of Contents
