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TARGET Series ENMET Corporation
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3.5.2 Calibration Status
The TARGET instrument 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-Up menu. 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.
N
OTE
:
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.
SELECT
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 TARGET instrument 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-Up menu. 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.
SELECT
Example: Display, Combustible Gas
3.5.4 Locations
The TARGET instrument has the ability to store user name or locations. They are entered into the instrument using the
TARGET Trakker software package, see section 7.0 for part number information. Set in accordance with software
manual.
POP-UP MENU
Auto-Zero Comb disp
*Cal Stat Location
SENSOR CAL STATUS
O2 OK May 15 1999
CO Calibration due
H2S OK May 15 1999
POP-UP MENU
Auto-Zero *Comb disp
Cal Stat Location
SET COMB GAS DISPLAY
Select type:
MTH(K=1.00)