ENMET Formaldemeter htV - Manual (Page 10)

ENMET Corporation Formaldemeter htV
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5.4 Calibration Adjustment Procedure
W ARNING : Please read this section thoroughly before attempting to adjust calibration. Users are strongly advised to familiarize
themselves with the instrument before attempting to adjust the calibration and should follow the instructions carefully.
Under normal operating conditions, instrument calibration should require only minimal periodic adjustment. To see whether a
full recalibration is required, perform a calibration check first as described in section 5.3.
5.4.1 Temperature equilibration
Leave the instrument and calibration standard in a room where the temperature is constant for at least one hour before
calibrating to allow thermal equilibration.
5.4.2 Procedure
1. Place the standard with the thermometer on a work surface. Handle the calibration standard as little as possible to avoid
heating the tube, holding it only by the yellow end caps.
2. Read the temperature on the thermometer and determine the required concentration reading from the lookup table on the
calibration tube.
For Example: Temperature: 23°C Reading: 3.2 ppm
3. Remove the yellow plugs from both ends of the calibration standard tube.
4. Press the O N -O FF button once to switch the instrument on.
5. Wait for the display to show
6. Insert the instrument nozzle into the sampling end of the calibration standard (indicated by the black arrow).
To maintain airtight contact between the nozzle and the standard, push the standard firmly against the instrument.
7. Simultaneously depress and release both Cal
▲ and ▼ buttons.
8. Will appear on the LCD, followed by the sound of the pump drawing a vapor sample from the tube.
9. When the pump stops, remove the calibration tube and replace both yellow end plugs.
10. As the instrument analyses the sample:
The display will show an increasing, then flashing value for 60 seconds, followed by:
alternating with
11. Now use the Cal
▲ and ▼ buttons to adjust the display reading to the required concentration.
12. Press the S AMPLE button to store this calibration value. The display will show:
followed by
The Formaldemeter
™ htV will then switch off automatically.
The instrument has now been recalibrated.