Toxalert Air Quality International

TOXALERT GUIDE SPECIFICATION
FOR
REFRIGERANT LEAK DETECTION SYSTEM

Toxalert Air Quality International
Provide a Toxalert model Tox-Refrig refrigerant leak detection and control system as specified. The refrigerant sensor(s) shall have a 4 to 20 mA output signal over its (0-500) PPM range. When a sensor malfunctions it shall signal the controller for annunciation of sensor failure.

The controller/annunciator Model Tox-Refrig shall be designed to be mounted outside of the mechanical room and shall have two (2) modes of control with two (2) levels of indication for each sensor input. The first mode, "warning," shall start the mechanical room ventilation equipment. The second mode, "alarm," shall light a red alarm light and sound the audible alarm port of the alarm. The audible alarm after being silenced, shall automatically reset and sound again at the next alarm occurrence. There shall be a light emitting diode (LED) for each refrigerant sensor to indicate warning stage, alarm stage, or sensor malfunction.

Per ASHRAE Std. 15-1994, there shall be a "purge" switch mounted on the face of the controller. The switch shall over-ride automatic control and manually activate the warning stage and ventilation equipment.

The controller shall have dry relay contacts for both the warning and alarm stages to control ventilation equipment and or interface to the facility EMS.

The controller panel front shall include the following labeled indicator lights and control switches:

  1. Power to system light.
  2. Labeled LED indicator for each sensor input
    1. LED lights green when warning level is sensed.
    2. LED lights red when alarm level is sensed.
    3. LED flashes red when sensor fault is detected.
  3. Audible alarm with silence push-button.
  4. Purge switch to manually activate the mechanical room ventilation equipment.
Provide a Model Tox-Refrig/ANA microprocessor based refrigerant leak detection sensor to monitor for refrigerant leaks. The sensing element shall be solid state metal oxide semiconductor for long life and stability. The sensor shall be powered by 24 VDC and have a 4 to 20 mA output signal proportional to the refrigerant level being detected. When the microprocessor detects a malfunction it shall drive its output to zero to signal the controllers of a sensor failure.

The sensor shall be housed in an explosion proof housing and have two meter terminal connections on the face of the unit for ease of checking unit calibration.

The refrigerant leak detection system shall be as manufactured by Toxalert International, Inc. or approved by this specifying engineer.

Options & Specifications for Options:
  1. Digital value display for indication of refrigerant concentrations in PPM.
    Single Sensor: Provide a LCD digital value display on the face of the controller to display the refrigerant level being detected. The display shall read in PPM (parts per million) of refrigerant.
    Multiple Sensor: Provide a LCD digital value display on the face of the controller to display the sensor sensing the highest concentration of refrigerant. Provide a push-button on the face of the panel for each sensor input so an operator can read the value of each sensor when its respective push-button is pushed. The display shall read in PPM (parts per million) of refrigerant.

  2. Rotating beacon.
    Providing a rotating light; 120 VAC, red, blue amber, green, or clear.

  3. Remote Alarm Panel.
    Provide a remote alarm panel to include alarm light and audible alarm horn (80 db) with silence push-button.



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