3M 75787 Instruções - Página 2

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2. To span the monitor:

a. Remove the protective plastic cap from the SPAN GAS cylinder, noting

the concentration of carbon monoxide printed on the cylinder.

b. Connect the plastic tubing provided in the kit to the plastic fitting, and

connect the opposite end of the tubing securely to the barbed fitting on

the regulator.

c. Connect the monitor's sample tube to the proper end of the

tubing/regulator assembly, described in the previous step.

d. Locate the SPAN adjustment potentiometer and verify the monitor has

had adequate warm-up time (see CO Monitor's User Instructions).

e. Screw the regulator valve onto the SPAN GAS cylinder outlet, making

sure not to "cross thread" the regulator or cylinder outlet port, and

tighten the regulator firmly. Open the knob on the regulator

counterclockwise to start gas flow.

f. Observe the display on the monitor. The reading will increase, and

then stabilize. As soon as the reading is stable (approximately one

minute), compare the value indicated on the display, with the value

noted on the SPAN GAS cylinder. If the display does NOT read the

same value as noted on the SPAN GAS cylinder, adjust the SPAN

potentiometer until the reading indicated on the display matches the

concentration of carbon monoxide printed on the SPAN GAS

calibration cylinder.

g. When these steps have been completed, close the knob on the

regulator clockwise to stop the gas flow. Unscrew regulator valve from

the SPAN GAS cylinder and replace the protective plastic cap.

h. Disconnect the associated calibration test tubing from the monitor and

reconnect the monitor's sample tube to the sampling supply on the

filtration system.

i. When using the small kit (part number 529-04-49 or automotive part

number 72012), be aware that the regulator valve allows gas to flow

from the cylinder as soon as it is tightened down. To conserve the gas

in the cylinder, do not attach the regulator valve until you are ready to

begin spanning the monitor and remove the regulator valve as soon as

spanning is complete.