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Output Loop-Powered Operation (Factory Setting)
The 4-20 mA output is factory set for loop-powered operation and requires a power source of 12 Vdc to 30
Vdc. The overall impedance depends on the voltage supplied at the 4-20 mA loop. Set jumpers on JP4 at 2-3,
4-5 and 6 for this type of configuration.
Permitted Impedance in the 4-20 mA Loop
Programming and Calibration
User Interface
When power is initially applied, the unit's LCD screen will display the product's name and firmware version.
Operating Mode
Normal Mode When the 301EM is in Normal mode, no user intervention is required. The display will scroll to
display (gas and concentration) readings from up to 20 sensors. The Tx LED will blink when
there is a transmission on the communication channel (if the unit is connected to a controller)
Alarm Mode
Red LEDs light per the alarm level detected (Alarm A, B or C). If the unit is equipped with a
horn or strobe, these will also be activated with the corresponding alarm.
Fault Mode
If a sensor has communication problems, the yellow Fault LED lights. This LED will also light
when the service alarm is activated.
Programming The programming mode is password protected.
Mode
Only qualified technicians should access this mode. The enter key provides access to program-
ming and confirms an entry, while the arrow keys allow technicians to increase or decrease
values and scroll throughout the menus.
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Voltage Source Applied
12 Vdc
16 Vdc
20 Vdc
24 Vdc
30 Vdc
Total Impedance
400 Ohms
600 Ohms
800 Ohms
1000 Ohms
1300 Ohms
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