B-7
8a) A single press of Switch Three (
) will produce
small incremental changes to increase display
reading, or a single press of Switch Four (
)
will produce small decremental changes to
decrease display reading, until the displayed gas
value corresponds to the concentration of the
calibration gas.
8b) When required reading has been reached, press
and hold Switch Four (
) to exit SPAN mode
with calibration. The display may jump above and
below required reading momentarily as the
instrument performs the calibration.
Note: If for any reason you require to exit SPAN mode
without calibration of the instrument. press and
hold Switch Three (
).
9) The instrument display will now return to CAL mode
display as shown in Figure B-7.
Figure B-7 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.
FIELD CALIBRATION
Summary of Contents for Gasurveyor 500 Series
Page 1: ...Gasurveyor 500 User Handbook Distributed By 713 844 1300 info heathus com www heathus com...
Page 6: ...GASURVEYOR 500 USER HANDBOOK iv...
Page 8: ...GASURVEYOR 500 USER HANDBOOK...
Page 14: ...GASURVEYOR 500 USER HANDBOOK xii...
Page 18: ...GASURVEYOR 500 USER HANDBOOK 1 4...
Page 54: ...GASURVEYOR 500 USER HANDBOOK 6 4...
Page 56: ...GASURVEYOR 500 USER HANDBOOK 7 2...
Page 60: ...GASURVEYOR 500 USER HANDBOOK A 4...
Page 70: ...GASURVEYOR 500 USER HANDBOOK B 10...
Page 96: ...C 26 GAS MEASUREMENT INSTRUMENTS LTD...
Page 101: ......