Heath Consultants Detecto-Pak 4 (DP) - Manual (Page 33)

CALIBRATION
100786-0 Rev. D 05/09
26
IMPORTANT
Special procedures must be followed when using the Detecto-Pak 4 at high
altitudes (over 3,000 feet above sea level). A slightly richer fuel mixture
(42% hydrogen/58% nitrogen) and increased fuel and sample flow rate
(50-55 cc/m and 850 cc/m, respectively) are required. The instrument must
be calibrated at elevation and re-calibrated if the elevation changes by
1000 feet or more. DO NOT use these settings below 3000 feet as the flame
ionization detector (FID) will burn too hot and possibly cause operational
and/or physical problems. If an improper (hydrogen higher than 42%) fuel
mix is used, the possibility of damage to the detector cell could be realized
as excessive heat is generated. Please contact servicing Heath Office for
proper ordering procedures.
9. The meter needle should register 100 (or same as calibration gas
used) on the 100 ppm range. If the needle is not on 100, you will
need to reset the instrument with the calibration (RP6) port.
10. If an adjustment is necessary to bring the meter needle to 100
(or same as calibration gas used) on the 100 ppm meter scale, an
adjusting control is inside the bottom rear of the instrument as
indicated in Figures 7 & 8. Access the CALIBRATION adjustment
through the LEFT-HAND ACCESS PORT on the rear of the
instrument located directly below the fuel cylinder holder.
11. Remove the plug from the port and use a micro-screwdriver to
adjust the CALIBRATION level using RP6 as required.
12. Repeat the above steps to verify the ZERO and CALIBRATION
levels.
13. Disconnect the calibration hose fitting from the sample inlet quick
disconnect on the filter housing and close the calibration cylinder
valve. Calibration is now complete.