Heath Consultants Gasurveyor 500 Series - Manual (Page 56)

GASURVEYOR 3-500 USER HANDBOOK
B-8
9) The calibrated instrument display will now return
to CAL mode display as shown in Figure B-8.
Figure B-8 50% LEL Display
10) Make sure that correct reading is displayed before
disconnecting the calibration gas then disconnect
tubing from instrument inlet and turn regulator
valve on calibration gas cylinder in a clockwise
direction to turn off gas flow.
11) Make sure that the regulator valve is in the fully
closed position (Off) then disconnect the regulator
from the gas cylinder (turn regulator body in a
counter clockwise direction).
12) Replace the cap on the calibration gas cylinder.
13) Repeat steps 1 to 12 for each range to be calibrated
otherwise quit FCM. See QUITTING FCM for
further details.