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3 Maintenance
A Periodic Maintenance
It is essential that the test and calibration schedule
be adhered to. Honeywell Analytics recommends the
following maintenance schedule:
• Response test prior to each use. Expose
sensor to a sample of the target gas to verify
proper sensor response and alarm functions.
• Calibration should be performed with certified
calibration gas every six months, and all tests
must be logged.
• Check filter material every six months. Replace
if dirty or moist.
• If the optional sensor keeper is used for extra
SMART-CELLs, change the sensor keeper
battery once every 6 months. Use only alkaline
“C” size batteries.
B Sensor Life
The electrochemical SMART CELL is extremely
reliable, but the following can cause the cell
chemicals to become depleted:
• A period of time
• Exposure to high temperatures
• Exposure to high concentrations of
the target gas
• Exposure to high moisture
When the cell becomes depleted, the unit will give no
indication of failure other than that the sensor will not
respond. For this reason it is absolutely essential that
these units be exercised with a gas sample on a
regular basis.
Typical sensor life under normal use is two years or
more. When the SMART-CELL will no longer calibrate
properly, simply purchase a new SMART-CELL and
replace.
C Calibration
Calibration is recommended every six months in
normal use. Each SMART-CELL stores its calibration
and alarm setpoint information on its own memory
chip. When the SMART-CELL is plugged into the
Manning EC-P2, this information is used by the
sensor. The SMART-CELL can be field calibrated by
the user or returned to Honeywell Analytics for
factory calibration.
The calibration procedure requires the use of a
bypass tee to allow the gas to be drawn into the flow
cell without creating variable pressure or dilution
problems. Calibration gas cannot be fed into the flow
cell under pressure.
When applying calibration gas use the bypass tee as
shown in Figure 4 on page 11. The flowrate of
calibration gas should be high enough that at least
0.5 SCFH is flowing out of the calibration tee. This
can be measured with the supplied flowmeter and
insures that air is not being drawn into the unit and
diluting the calibration gas.
The unit may be zeroed without spanning it; however,
never span the unit without first zeroing it.
The following procedure will calibrate the SMART-
CELL.
To Enter ZERO / SPAN Mode
1) Push power button to turn unit on. Wait for
power up sequence to finish (30 seconds).
2) Push and hold the unnamed button (second
from left) first, then Push and hold the Menu
button. Hold both buttons until the screen goes
blank (2 seconds). Release both buttons and
the unit is now in Programming Mode.
3) Push the SENS button and the unit is now in the
zero/span mode.
Manning EC-P2 Sensor 19546 ECP2 07/09 REVG Copyright © 2009 Honeywell Analytics. All Rights Reserved. 9