RKI Instruments M2 for 12 VDC User Manual
Page 31
M2 Transmitter Operator’s Manual, 12 VDC Operation
26
2.
Screw the calibration cup onto the detector.
3.
Connect the fixed flow regulator to the calibration cup using the sample tubing.
Non-Intrusive Calibration
If the M2 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 M2’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 M2 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 calibration if the detector is
mounted remotely from the M2. When zero air is applied to the M2 during a fresh air
adjustment, the M2 will freeze the display reading at the lowest response and the M2 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 M2 during a span
adjustment, the M2 will freeze the display reading at the highest response to the
calibration gas. The calibration gas can then be removed and the M2 will continue to
display this reading and retain it in its memory until the span adjustment procedure is
completed.
Adjusting the Fresh Air Reading
1.
While in normal operation, press and hold the UP/YES button for 5 seconds to enter
Calibration Mode. Release the button when the following screen appears.
2.
If you want to continue with calibration, press and release the UP/YES button. The
display will indicate the target gas and CAL Mode for a few seconds before showing
FreshAir Adjust?
.
If you want to exit Calibration Mode, press and release the DOWN/NO button. The
M2 will indicate Leaving CAL Mode and then return to normal operation.
3.
To continue with adjusting the fresh air reading, press and release the UP/YES button.
ENTER
will alternate with FreshAir on the top display line and the current gas
reading will be on the bottom display line.
To skip adjusting the fresh air reading, press and release the DOWN/NO button. The
display will indicate SPAN w/Cal Gas?. Skip to the next section, “Adjusting the Span
Setting”.
4.
Screw the zero air cylinder into the fixed flow regulator.
5.
Turn the regulator knob counterclockwise to open the regulator.
6.
Allow zero air to flow for two minutes. If there was gas present causing a reading on
the M2, the reading should decrease and stabilize after two minutes.
7.
Turn the regulator knob clockwise to close the regulator.
Calib?
YES/NO