Operator Manual
Page
19
of
40
P/N 1580281
SEC3120 Digital Transmitter
Sensor Electronics Corporation
Rev 10, 20150707
Scroll down to and select ENTER on EXIT to return the
screen to the Normal Operating Display.
8.5.
Alarm Settings – Threshold Values and Active Mode
In the ‘ALARM’ menu the user can set the thresholds for the Low, Mid and High alarms for both sensors.
The default values for these settings are Low = 20% full scale, Mid = 40% of full scale and High = 60% of
full scale.
The ‘Active Mode’ of each alarm set point can also be changed in this menu. An Active High
setting will trigger the alarm when the gas concentration is rising and crosses the threshold set point. An
Active Low setting will trigger the alarm when the gas concentration is falling and crosses the threshold
set point.
The user can also change the “MUTE ON WARN” setting. This setting determines how the
transmitter acts when the attached sensor goes into a warning (only applies to SEC5000 Evolution and
SEC3300)
. The default for this setting is “NO” meaning that if the unit goes into a warning but still senses
gas, the transmitter relays will activate (LEDs will also change) and communicate to the SEC3500 when
an alarm threshold has been met. Turning the setting
“YES” will keep the transmitter relays from
activating and the LEDs from changing color when the unit is in a warning.
Alarm Menu (Selected from the Main Menu)
Move the cursor to ALARM and select ENTER to open the
alarm menu.
ENTER on ‘FOR SENSOR’ ‘ONE/TWO’ to
choose which sensor to perform alarm
configuration operations.
DOWN switch to select sensor one
Up switch to select sensor two
Move the cursor to the alarm to set (LOW, MID or
HIGH) and select ENTER.
To set the alarm set-point move the
cursor to THRESHOLD and select
ENTER.
Using the UP and DOWN
switches set the desired value
then select ENTER.
Selecting ACTIVE MODE will allow the
operator to change the operation of the
alarm activation operation from Active
HIGH to Active LOW. Once the correct
operation is selected select ENTER.
-
HIGH activates the alarm on a rising gas level.
-
LOW actives the alarm when the gas level falls below the
alarm set point.
ENTER on ‘PREVIOUS MENU’ to return
to the Alarm Menu and choose to save or
abort the changes.
* THRESHOLD
‘value’
ACTIVE MODE HIGH/LOW
PREVIOUS MENU
* THRESHOLD
‘value’
*
ACTIVE MODE HIGH/LOW
PREVIOUS MENU
THRESHOLD
‘value’
* ACTIVE MODE HIGH/LOW*
PREVIOUS MENU
CALIBRATION
*
ALARM
RELAY
NETWORK
*
FOR SENSOR: ONE / TWO
LOW
MID
HIGH
FOR SENSOR: ONE / TWO
*
LOW
MID
HIGH
THRESHOLD
‘value’
ACTIVE MODE HIGH/LOW
* PREVIOUS MENU
SEC DIAGNOSTICS
RESET RELAYS
FORMAT FLASH CARD
* EXIT
