Rh And T Adjustment Of The Ee07 Probes; Definitions; Ee07 Adjustment With Ee220 Basic Device; 2-Point Rh And T Adjustment - E+E Elektronik EE220 Operating Instructions Manual

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RH and t Adjustment of the EE07 Probes

8.1

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
certificate. 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.
8.2

EE07 adjustment with EE220 basic device

• 1-point RH or T adjustment for optimal performance over a narrow RH or T range.
Example: climate monitoring in a pharma manufacturing site.
RH range: 40...60 % RH  RH adjustment point: 50 % RH
T range: 15...25 °C
• 2-point RH or T adjustment for accurate measurement over a wide RH or T range.
Example: outdoor measurement
RH range: 10 ... 100 % RH  RH adjustment points: 40 % RH, 70 % RH
T range: -30 ... 35 °C
• The adjustment data is saved into the EE07 probes. The EE220 basic unit is not affected by the
adjustment procedure. Consequently, it is possible to replace the probes at any moment.
• Start the adjustment procedure with the low point (e.g. 30 % RH) and continue with the high
point (e.g. 80 % RH)
• For accurate calibration or adjustment, the specimen and the reference must have same T.
• During calibration or adjustment the T shall remain constant.
• Allow min. 30 min, stabilization time for RH calibration or adjustment.
• If needed, clean the sensors (see "Cleaning Instructions" at www.epluse.com) and replace the
filter cap by a new one.
Please note: A display facilitates considerably the calibration and adjustment. An EE220 without
display can be easily retrofitted by simply plugging on a display (see chapter "9.1. EE220 check
using the display"). Furthermore, one and the same display can be plugged onto any EE220 just
for adjustment and calibration.
8.2.1

2-point RH and t adjustment

1. Set the jumper to RH calib or to T Calib.
2. Place the probe into the corresponding calibrator and let it stabilize at the first point (low) for
at least 30 minutes.
3. Press and hold S2 for 3 seconds. The LED "Calib" will light and the symbol "CAL<" will ap-
pear on the EE220 display.
4. Push S1 (up) or S2 (down) to bring the measured value in line with the reference in steps
of 0.1. The actual corrected value is indicated on the display and can be measured at the
analogue output.
5. Press and hold S1 for 3 seconds to store the value into EE07 and end the first (low) point
adjustment. The LED "Calib" will be deactivated and the display will show "CAL"
Operating instructions for EE220 humidity / temperature transmitter
 T adjustment point: 20 °C
(59...77 °F)
 T adjustment points: -10 °C
(-22...95 °F)
(68 °F)
, 15 °C
(14 °F) (59 °F)
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