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TARGET Series ENMET Corporation
7
3.4.3 Over-range and Under-range Alarms
The over-range alarm activates audio and visual alarms. It can occur if the instrument is exposed to a gas
concentration higher than its display range. Over-range alarms cannot be acknowledged. An alarm for the Toxic or
Oxygen sensors clears once the over-range condition clears. The over-range alarm for the combustible sensor is
latching and will not clear until the instrument has been removed from the affected area, turned off and turned on in an
environment less than 100 %LEL. Under range conditions can occur if an instrument is auto-zeroed or calibrated in an
area with background levels of gas. Under range alarms can be cleared by performing an auto-zero function as
described in Section 3.5.1.
The over-range condition is indicated by OVERNG shown in the affected sensor location on the display. Under-range
is indicated by UNDRNG.
3.4.4 Low Battery
The TARGET Series instrument has a low battery alarm to provide the user with adequate warning of a low battery
condition. The instrument provides a steady tone audio alarm when there is approximately 15 to 30 minutes of battery
life left. A low battery warning message is displayed on the status line of the instrument LCD. The audio alarm can
be acknowledged by pressing the SELECT button. The audio alarm and backlight reactivate after approximately five
minutes. See section 3.2 for battery charging procedure.
3.4.5 Fault
Fault alarms have a steady audio alarm and are displayed on the status line of the LCD. The status line describes the
fault condition and appropriate action should be take to resolve the issue. See section 11 for troubleshooting
information.
3.5 Pop-Up Menu
The Pop-Up menu is displayed after the one minute instrument warm-up procedure. The instrument beeps several
times prior to showing this display. The Pop-Up menu provides the user the ability to perform an auto-zero, check the
last date of calibration, change the combustible gas display, set user locations and activate/deactivate the optional
internal pump, if installed.
Example: Pop-Up Menu
N
OTE
: The Pop-Up menu can be accessed at any time during normal instrument operation by pressing and holding the
MENU button for approximately two seconds while the instrument is at the Main Gas display.
3.5.1 Auto-Zero
To compensate for sensor aging and drift, the TARGET instrument has an Auto-Zero function. Zeroing the instrument
sets all gas readings to zero and sets the oxygen to 20.9%.
This function must be performed in a fresh air
environment
.
To perform an Auto-Zero, press and hold the Menu button to enter the Pop-Up menu. Note the asterisk next to Auto-
Zero. Press the SELECT button. The instrument electronically compensates all sensor readings. OK is displayed
next to all sensors where valid adjustments are made. The sensor readings must be within an acceptable range when
the Auto-Zero function is initiated, otherwise FAIL or ERR is displayed next to the affected sensor.
SELECT
Example: Display, Auto-Zero from Pop-Up Menu
POP-UP MENU
*Auto-Zero Comb disp
Cal Stat Location
Set Pump ON
POP-UP MENU
*Auto-Zero Comb disp
Cal Stat Location
O2 : OK
CO : OK
H2S: OK
Mth: OK BRH: OK