Heath-consultants Detecto-Pak 4 (DP) Manual de usuario descargar pdf (Pagina 28)

Operation

100786-0 Rev. D 05/09

13. To check pulsating signal alarm operation by press zero up switch

until pulsating alarm sounds. Allow time for the meter to settle. The

pulsating alarm should turn on at a meter reading between 35-45%

of full scale. Return meter reading to zero.

14. To verify that the instrument is operational, the Detecto-Pak 4’s

sensitivity should be tested by introducing a small sample of a

known hydrocarbon gas to the sample inlet. The meter should swing

upscale and return to zero.

15. The Detecto-Pak

4 is now operational.

C. ZERO PROCEDURES

Zero the instrument as needed by the following procedure.

Before zeroing the Detecto-Pak 4, two conditions must be met:

1. The instrument must be fully charged, and

2. Either zero air from a demand regulator or a veried hydrocarbon

free atmosphere must be used. Zero air is recommended. The Average

background level of methane in the atmosphere is 2 ppm.

Zeroing Procedure:

a. With the instrument’s power off, mechanically zero the meter using

a small blade screwdriver.

b. Start and warm-up the instrument as described under “OPERATING

PROCEDURES’, Chapter Five, Section V, B.

c. Coarse zero the instrument on the 10 K ppm range. A micro

screwdriver will be needed to adjust the potentiometer (RP8)

located behind the right-hand (inner most) access plug on the rear

of the instrument below the fuel bottle holder. Remove the plug to

access the adjusting potentiometer. Refer to Figures 7 and 8 in the

manual.

**NOTE**

The ne zero control is automatically centered upon power-up. Do not

adjust the ne zero (by using the zero controls on the top panel) at this time.

d. Select the 50 ppm range and re-adjust the coarse zero.

e. Re-insert the plug into the right hand access port.

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Heath-consultants Detecto-Pak 4 (DP) Manual de usuario Pagina 28