M2A Transmitter Operator’s Manual 51
Non-Intrusive Calibration
If the M2A is installed in a classified area and non-intrusive calibration is required, follow the instructions below,
but do not remove the junction box cover. Use the magnetic wand accessory to actuate the magnetic switches
instead of pushing the control switch buttons. To actuate a magnetic switch and perform the same operation as
pressing a control switch button, touch the magnet in the end of the magnetic wand to the M2A’s glass cover
directly above the magnetic switch you wish to actuate. Touching the glass and removing the wand is the same as
pressing and releasing a button. Touching the glass and keeping the wand in place is the same as pressing and
holding a button.
Calibration Gas Response Memory Feature
The M2A has the capability to “remember” the detector’s response to the calibration gas after the gas is removed
from the detector during the fresh air and span adjustment procedure. This feature enables one person to perform
a calibration if the detector is mounted remotely from the M2A. When zero air is applied to the M2A during a
fresh air adjustment, the M2A will freeze the display reading at the lowest response and the M2A will continue to
display this reading and retain it in its memory until the fresh air adjustment procedure is completed. When
calibration gas is applied to the M2A during a span adjustment, the M2A will freeze the display reading at the
highest response to the calibration gas. The calibration gas can then be removed and the M2A will continue to
display this reading and retain it in its memory until the span adjustment procedure is completed.
Preparing for Calibration
NOTE: The following procedure assumes the use of a calibration kit which includes a calibration gas
cylinder, a zero air cylinder, a fixed flow regulator with an on/off knob, a calibration cup for the
appropriate sensor, and a short piece of sample tubing to connect the regulator to the calibration cup.
NOTE: While in the calibration program, if there is no switch activity for the calibration time-out period the
unit will return to normal operation. See “Viewing & Changing M2A Parameters” on page 42 for
instructions to set the calibration time-out.
NOTE: The following procedure assumes that the target gas is present in a high enough concentration to
affect the fresh air (zero) reading. If a fresh air environment can be verified, applying zero air to the
detector is not necessary when setting the zero (span for oxygen) reading.
CAUTION: If calibrating a CT-7 Series M2A, allow the instrument to warm up for 15 minutes before
performing a calibration.
WARNING: RKI Instruments, Inc. recommends that you dedicate a regulator for use with chlorine
(Cl
2
) gas and that you do not use that dedicated regulator for any other gases,
particularly hydrogen sulfide (H
2
S).
1. Connect the calibration kit sample tubing to the calibration cup hose barb.
2. Screw the calibration cup onto the detector.
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