Heath Consultants Detecto-Pak 4 (DP) - Manual (Page 31)

CALIBRATION
100786-0 Rev. D 05/09
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B. CALIBRATION PROCEDURES (Figure 6)
**NOTE**
A calibration kit & calibration cylinders are available to calibrate the
Detecto-Pak 4. Any other method will not insure proper calibration levels.
Allow instrument to warm up 15 minutes prior to calibration.
1. Start with the Detecto-Pak 4 in operation as described under
“OPERATING PROCEDURES.” (See Chapter Five, Section V, B)
2. Set the instrument on a flat, horizontal surface. The instrument must
remain in this position throughout the calibration procedure. On
power-up, the fine zero position is automatically set to mid range
electronically. If any fine zero adjustments are made after power-up,
they will be reset when the instrument is powered off.
3. Put the instrument in the 10 ppm range. The meter needle should be
set to zero. If the needle is not on zero, you will need to reset the
instrument with coarse zero (RP8) port.
4. If an adjustment is necessary to bring the meter needle to zero on the
10 ppm meter scale, an adjusting control is inside the bottom rear
of the instrument as indicated in Figures 7 & 8. Access the ZERO
adjustment through the RIGHT-HAND ACCESS PORT on the rear
of the instrument located directly below the fuel cylinder holder.
5. Remove the plug from the port and use a micro-screwdriver to adjust
the ZERO level using RP8 as required.
6. Put the instrument in the 100 ppm range. There should be no
significant drift or movement of the meter needle. The needle should
remain relatively stable on zero.
**NOTE**
Calibration must be conducted in a hydrocarbon-free (clean air)
atmosphere.