Sensor Fault, Sensor Life | Millennium Enterprises MLP-A/AR specification

Net Safety Monitoring Inc.

SELECT DISPLAY LANGUAGE

Step 1: After the Restricted Menu the option Select Display Language

YES? displays. Press the Calibration Button or use the Reed Switch to select.

The flashing YES confirms the selection.

Step 2: When the required language displays (English , Espanol , Francais ) press the Calibration Button or use the Reed Switch to select.

The flashing YES confirms the selection.

Note: Factory default is English.

ALARMS

Sensor Fault

WARNING:

The fault detection circuitry does not monitor the operation of external response equipment or the external wiring to these devices. It is important that these devices be checked periodically to ensure they are operational.

Self-testing circuitry continuously checks for problems that could prevent proper response. When power is applied, the microcontroller automatically tests the system to ensure that it is functioning properly. During normal operation, it continuously monitors the signal from the internal sensor source. In addition, a "watchdog" timer is maintained to ensure the program is running correctly. When a system fault is detected, the Status LED will Red Slow flash, the display show Sensor Fault and analog output change to 2.5 mA.

Non-standard O2 Levels

When levels >20.9 or <20.9 are detected, the display shows the oxygen level, in percent, on the left side of the display and the LED will blip green. Current output will vary, depending on the O2 level.

If an alarm set-point is reached, the %O2 still displays to the left but a High Alarm or Low Alarm message will scroll to the right and the LED will blip/ blink red. Current output will vary, depending on the O2 level.

Over range is reached if the O2 level exceeds 25%. The display shows <25%O2, the LED goes solid red and 20 mA is delivered.

Sensor Life

Depending on various factors, sensor response may slowly deteriorate over time. If calibration becomes impossible for any reason, the display will show Fail Cal , the analog output will switch repeatedly between 3.0 mA and 3.3 mA and the Status LED alternates Red and Green flashes.

RESET

Manual Reset

A Manual Reset is required after a calibration failure or to clear a latched relay alarm. Simply place and hold the magnet against the Reed Switch or press and hold the Calibration Button for 3-5 seconds. The unit will return to normal operation using previous calibration values.

Remote Reset

If Relay Option is set to Latching (refer to "Setting Relay Options" on page 15) and an open Push Button Switch is connected between the RST terminal and the COM terminal on the Terminal Board, Remote Reset is possible. Also refer to "Remote Reset" on page 9 for details.

MLP-A/AR/AD-ST1400-25