O2 Innovations pmn Example Display of Calibration Status, Programmed Flammable Gas Coefficients

TARGET Series ENMET Corporation

3.5.2 Calibration Status

The TARGETinstrument keeps track of the date of last calibration for each sensor. To view the last calibration date, press and hold the Menu button to enter the Pop-Upmenu. Press the MENU button two times to move the asterisk to the Cal Status position, then the SELECT button once to select the Calibration Status screen. The display shows the status of up to three sensors. Press the SELECT button to view the remaining sensors. If any of the sensors are overdue for calibration, Calibration due is displayed next to it. If a sensor has failed a calibration, Cal error is displayed next to appropriate sensor.

NOTE: OK appears next to each sensor that has been calibrated within the last 90 days. Field tests must still be performed to confirm the performance status of each sensor.

POP-UP MENU Auto-Zero Comb disp *Cal Stat Location

SELECT

SENSOR CAL STATUS

O2	OK	May	15 1999
CO	Calibration due
H2S	OK	May	15 1999

Example: Display of Calibration Status

3.5.3 Combustible Gas Display

Combustible gases vary considerably with respect to their flammable nature. Some gases are flammable at lower concentrations than others. The TARGETinstrument has ten flammable gases response characteristics programmed in memory. Each gas has a different coefficient (K) that is used to compensate the instrument display:

Table 2: Programmed Flammable Gas Coefficients

Methane	Mth	K=1.00
Propane	Prp	K=1.88
Butane	Btn	K=2.04
Pentane	Pnt	K=2.30
Hexane	Hxn	K=2.35
Hydrogen	H2	K=1.24
Ethane	Eth	K=1.54
Benzene	Bnz	K=2.51
Toluene	Tln	K=2.47
Xylene	Xyl	K=2.99

The combustible sensor cannot determine which gas is present. When the combustible gas is unknown, it is recommended to change the display to higher K (coefficient) value gas. Hexane or Xylene may not be the gases present, but using their K value substantially increase, the instrument’s sensitivity to flammable gases.

To select a different combustible gas display, press and hold the Menu button to enter the Pop-Upmenu. Press the MENU button three times to move the asterisk to the Comb disp position. Press the SELECT button once to choose this screen. Press the MENU button to sequence through the list shown in Table 2. The instrument automatically changes the combustible display to the last one displayed.

POP-UP MENU Auto-Zero *Comb disp Cal Stat Location

SELECT

SET COMB GAS DISPLAY Select type: MTH(K=1.00)

Example: Display, Combustible Gas

3.5.4 Locations

The TARGETinstrument has the ability to store user name or locations. They are entered into the instrument using the TARGETTrakker software package, see section 7.0 for part number information. Set in accordance with software manual.

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