ENMET MedAir 2200, Руководство по эксплуатации и обслуживанию, Страница: 18 / 41

MedAir ENMET
Manual Release Date – June 9, 2017 P a g e | 17
Manual Part No. – 80002-042
5.3 Calibration for CO, O
2,
HC and CO
2
(Gas Channels)
Calibration is the process of setting the instrument up to read accurately when exposed to a target gas. This is a two step process.
A Low Calibration sets clean air reference point and the High Calibration function sets the sensitivity of the instrument.
Calibration equipment is available from
ENMET to calibrate the M
ED
A
IR
2200 . A list of needed material is in Section 7.0. A
calibration adapter will have a fitting for the gas cylinder on one side, and a quick-disconnect to attach to the instrument on the
other.
You may exit the calibration section, at any time, by
pressing and holding the
OPTION
switch for 3 seconds, if entering calibration
section by mistake or calibration gas is not available.
Wait 24 hours after initially supplying air and power to the
M
ED
A
IR
2200 sensor before initial calibration. It is not necessary to
open the Front Panel to make adjustment. The calibration functions are operated through the
OPTION
and
SELECT
switches on the
front panel.
After entering a valid password to maintenance menu, see
Section 5.2.1 , the calibration section is the first menu section; enter by
pressing the
SELECT
switch.
Supply sensor with clean air for LowCal/ZeroCal setting and apply calibration gas for HiCal/SpanGas setting.

Press the
SELECT
switch "Calibration Select XX " is displayed. XX = the gas to be calibrated

Press the
OPTION
switch, if needed, to change to the gas to be calibrated.

Press the
SELECT
switch, the gas & current readings are displayed in upper portion of display. The mV reading & "LowCal
0" is displayed in the lower portion of display. This is the LowCal setting, usually zero , clean air must be supplied to the
sensor. This reading needs to be at or near zero. If it is not, then a cylinder of clean 20.9 air should be used. See Figure 7 if
this is required.

Press the
SELECT
switch, that moves the cursor one digit to the right when the last digit is accepted the display will move to
"HiCal xx " gas calibration. xx = the level of gas to be used for calibration. The mV reading is shown in the upper right hand
corner of the display.

Apply calibration gas to sensor. See Figure 7 . After about 1 minute and mV reading has stabilized.

Press the
SELECT
switch, that moves the cursor one digit to the right, when the last digit is accepted and the calibration is
successful the display will momentarily show Cal OK then slope and off set readings, before returning to the Calibration
Menu
Repeat above steps for each channel to be calibrated.
To continue on to next section, Press the
OPTION
switch.

Press
OPTION
switch until “Exit Maint Menu” appears and then press
SELECT
switch to return the instrument to the
Operational Display
Example: Full Calibration Flow Chart, for CO
From Valid Password Entry
N
OTE
: The dew point sensor/probe cannot be calibrated in the field and should be replaced every two years.
O
S
S
Calibration
Select (Gas)
MAINTENANCE MENU
Calibration
O
Press O
PTION
until the gas to be
Calibrated is displayed
CO:
XX
11
LowCal: 0000
S each digit
CO:
XX
14
HiCal: 0000
S each digit
Default Calibration Points
Gas LowCal HiCal
CO 0 20
O2 N/A 20.9
CO
2
0 1000
HC 0 10
O = Press Option
S = Press Select