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Cool Air Watchman Series Manual

Ammonia leak detection systems
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Summary of Contents for Cool Air Watchman Series

  • Page 1 WATCHMAN LBW-...
  • Page 2 — — ..................4 ........... 4 .............. 6 ..............7 ........... 7 ..............8 “ ” “ ” “ ” “ ” “ ” “ ” ..... 9 ............9 ..................11 – ............11 – LBW-WATCHMAN .......... 12 IRING THE ........
  • Page 3 Ammonia Detection 0 to 500 PPM Sensitivity Display 0.8”, 7-segment LED, 4-digit Mode, enter, Up, and Down pushbuttons Controls Rotary selector switch * High selectivity to NH3 * Small influence by H2S * Excellent durability to NH3 exposure Ammonia Sensor * Linear output * Long life * Stable baseline...
  • Page 4 — — After applying power be sure the detector has been powered for at least 20 minutes before testing or calibrating. Adequately cover the detector sensor during washdown and avoid spraying the washdown liquid directly onto the sensor. To avoid nuisance alarms, place the detector in service mode before: •...

  • Page 5: Standard Features

    The Cool Air Incorporated WATCHMAN is a 24VDC powered state-of-the-art ammonia leak detector that detects and displays ammonia concentrations of 0 to 500 parts per million (PPM). It comes equipped with an electrochemical, long-life ammonia sensor that has a quick and accurate response to ammonia concentrations.
  • Page 6 • A quick connect ABS wash-down tube installed over the • sensor so that it does not get wet during washdown • A remote alarm light and horn box with or without a toggle • switch to TEST/NORMAL/SILENCE the alarm •...
  • Page 7 The detector comes with an electrochemical, long-life sensor that has a high sensitivity to ammonia quick response time. The sensor is protected by a pre-filter to extend the life in harsh environments. The sensor is also designed for a quick attach washdown tube. FIGURE 1 The panel-mounted circuit board contains the controls necessary for programming and operating the detector.
  • Page 8 “ ” “ ” FIGURE 2 The detector can be set to one of four modes: normal operating mode or program mode, service mode or program and service mode. The detector is in normal operating mode when the “program” and “service”...
  • Page 9 “ ” “ ” “ ” “ ” “ ” “ ” FIGURE 3 The “UP” and “DOWN” buttons are used for setting the digital display to the desired value, and the “ENTER” button is used for saving a value previously set on the digital display. These buttons are used when programming: the set points and other optional settings and during calibration of the detector.
  • Page 10 Use the following chart to select the switch position for the desired function: Set the Rotary Selector See Page # Switch to: Display ammonia concentration in PPM Display ammonia concentration in PPM Display the firmware revision Program the ammonia High alarm set point Program the ammonia Low alarm set point Display ammonia concentration in PPM (See Section Testing your system) Factory Use...
  • Page 11 Power for the WATCHMAN must be a DC voltage between 18 and 36 volts with a current rating of at least 0.25 amps at 24 volts. Power is connected to terminal block TB1. “I+” for +DC Volts and “GndI” ground DC Volts. –...
  • Page 12 Wiring the LBW-WATCHMAN: For the WATCHMAN, the 4-20 mA output is a simple series circuit that includes the detector, a 24 VDC power supply, and the receiving device. It is recommended that a 24 VDC, low-noise power supply be used for this application, although power supplies providing a minimum of 18 VDC to a maximum 36 VDC can be used.

  • Page 13: Installation And Setup

    Caution: REMOVE THE RED CAP PROTECTING THE SENSOR DURING INSTALLATION The detector should be mounted in a location where ammonia leaks are most likely to occur, such as near valve groups, compressors, and refrigeration coils. Be sure the detector is visible and easily accessible.

  • Page 14: P R O G R A M M I N G A N D O P E R A T I On

    The WATCHMAN detector is easy to program and operate. Follow the instructions in this section to: • Set the desired display mode • Program the ammonia alarm set points (for use with CAI DSAP and other accessories) • Program the desired 4 to 20mA range. •...
  • Page 15 PPM value indicated by the 4-20 mA signal is better than on higher ranges and this range is compatible with external equipment like the Cool Air DCSAP. Use the other ranges if there is reason to measure ammonia concentrations other than 250 PPM. To program the 4-20...
  • Page 16 Programming the service mode timeout When the Watchman is placed in Service Mode” it will disable the Lo-Alarm and Hi Alarm outputs used with the CAI DCSAP and send the 4 to 20mA signal to near 4mA or 0ppm. This allows maintenance, testing or calibration to be accomplished without activating event responses.

  • Page 17: T E S T A N D C A L I B R A T I On

    At the time of calibration, you must use certified test gas. The mix of ammonia to air equal to the calibration set point. This can be purchased from Cool Air Inc. or their distributors. The detector is initially calibrated and programmed at the factory.
  • Page 18 Apply span gas certified span gas at 0.3 L/min (span gas must be in air, not nitrogen or other carrier) until a stable ammonia concentration reading is displayed or 2 minutes, whichever occurs first. Check the following: Digital display shows an increasing concentration of ammonia in PPM.

  • Page 19: Technical Support

    Apply span gas certified span gas at 0.3 L/min (span gas must be in air, not nitrogen or other carrier) until a stable ammonia concentration reading is displayed or 2 minutes, whichever occurs first. Press the “UP” or “DOWN” button until the display indicates the concentration of the known sample.

  • Page 20: Warranty

    For technical support, contact Cool Air Incorporated using any of these methods: Contact: Technical Support Phone: (763) 205-0844 (USA) Fax: (763) 432-9295 (USA) E-mail: info@coolairinc.com Web site: www.coolairinc.com Address: Cool Air Incorporated 1544 134 Ave NE Ham Lake, MN 55304 36-Month Limited Warranty &...
  • Page 21 Cool Air Incorporated shall have no further obligation under this limited warranty. All warranty obligations of Cool Air Incorporated are extinguishable if the Product has been subject to abuse, misuse, negligence, or damage by accident or abnormal conditions of operation, handling or...
  • Page 22 WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED Limitation of Liability IT IS UNDERSTOOD AND AGREED THAT COOL AIR INCORPORATED’S LIABILITY, WHETHER IN CONTRACT, IN TORT, UNDER ANY WARRANTY, IN NEGLIGENCE OR OTHERWISE SHALL NOT EXCEED...
  • Page 23 23 | P a g e Rev 2-0 8/1/2018...
  • Page 24 24 | P a g e Rev 2-0 8/1/2018...

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