Cool Air Watchman Series User manual

WATCHMAN
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4– –2 20 0
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WIRING THE LBW-WATCHMAN..........................................12
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IN NS ST TA AL LL LA AT TI IO ON N A AN ND D S SE ET TU UP P . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . 1 13 3
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PROGRAMMING THE AMMONIA LEVEL 4-20 MARANGE..........15
PROGRAMMING THE SERVICE MODE TIMEOUT........................16
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TE ES ST T A AN ND D C CA AL LI IB BR RA AT TI IO ON N . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . 1 17 7
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TESTING AND MAINTENANCE SUPPLIES....................................19
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TE EC CH HN NI IC CA AL L S SU UP PP PO OR RT T
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Sp pe ec ci if fi ic ca at ti io on ns s
Ammonia Detection
Sensitivity
0 to 500 PPM
Display 0.8”, 7-segment LED, 4-digit
Controls
Mode, enter, Up, and Down pushbuttons
Rotary selector switch
Ammonia Sensor
* High selectivity to NH3
* Small influence by H2S
* Excellent durability to NH3 exposure
* Linear output
* Long life
* Stable baseline
* Unique leak-proof structure
Outputs
4-20 mA DC, conforming to S50.01 ratings,
Type 2L
Operating Temperature -50°F to 125°F
Operating Humidity 5% to 95% RH, non-condensing
Power Requirements
18 to 36 VDC
0.25 Amps max.
Dimensions 4½”H x 7½”W x 4½”D
Weight 1.5 lbs.
Enclosure NEMA 4X rated, UL listed
Pollution Degree 1

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IM MP PO OR RT TA AN NT T— —R RE EA AD D T TH HI IS S F FI IR RS ST T
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CA AU UT TI IO ON N: :
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.
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Av vo oi id di in ng g N Nu ui is sa an nc ce e A Al la ar rm ms
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To avoid nuisance alarms, place the detector in service mode
before:
•Performing maintenance, repairs, testing, or calibration.
•Washing down the area.
Furthermore, be sure of the following before placing the detector in
normal operating mode:
•The ammonia concentration reading is below the Low-
alarm set point.

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IN NT TR RO OD DU UC CT TI IO ON N
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.
The WATCHMAN requires a DC supply voltage between 18 and
36 volts DC.
The WATCHMAN is configured to supply power to the 4-20 mA
circuit(s). Refer to 4
4– –2 20 0 m mA A A An na al lo og g O Ou ut tp pu ut ts s f
fo or r m mo or re e d de et ta ai il ls s.
.
S ST TA AN ND DA AR RD D F FE EA AT TU UR RE ES S
The WATCHMAN comes with these additional standard features:
•Programmable Lo-Alarm and Hi-Alarm set points (for use
with Cool Air Incorporated Digital Central Supervisory
Alarm Panel, Local mount or remote alarm light and
horn, or remote alarm light and horn).
•4-20 mA analog output signals, for ammonia level which
can communicate directly with computer systems such
as PLC’s.
•Selectable PPM reading start (0PPM, 10PPM, or 25PPM)
•The detector hardware and the connected system response
can be tested without exposing the sensor to ammonia
•Selectable Service Mode timeout.
•A NEMA 4X, UL-listed enclosure.
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AV VA AI IL LA AB BL LE E O OP PT TI IO ON NS S
•
• A remote ammonia sensor with cable allowing the sensor
to be located a maximum of 500 feet away from the
detector
•
• D Do oo or r M Mo
on ni it to or r
•
• E Ex xt te er rn na al l S Se er rv vi ic ce e M Mo od de e S Sw wi it tc ch h, , L Lo oc ca al l o or r R Re em mo ot te e, , K Ke ey ye ed d o or r
n
no ot
t k ke ey ye ed d. .

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•
• 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
•
• A local mount alarm light and horn box with or without a
toggle switch to TEST/NORMAL/SILENCE the alarm
•
• A AC C P Po ow we er r S Su up pp pl ly y ( (m mo ou un nt te ed d e ex xt te er rn na al ll ly y b by y t th he e c cu us st to om me er r) )
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PA AR RT TS S D DE ES SC CR RI IP PT TI IO ON N
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Fr ro on nt t P Pa an ne el l D Di is sp pl la ay y
The front panel display is comprised of a digital display. The seven-
segment, four-digit display indicates a variety of information, such
as ammonia concentration and more, depending on the position of
the rotary selector switch. Ammonia concentration is displayed in
parts per million.
FIGURE 0

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A
Am mm mo on ni ia a S Se en ns so or r
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
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Pa an ne el l- -M Mo ou un nt te ed d C Ci ir rc cu ui it t B Bo oa ar rd d
The panel-mounted circuit board contains the controls necessary for
programming and operating the detector. Each control is described
in detail below.

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T
Th he e “ “M MO OD DE E” ” P Pu us sh hb bu ut tt to on n
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” LEDs are off. The detector will be in program mode when
the “program” LED is on. The detector will be in service mode
when the “service LED is on. When both the “program” and
“service” LEDs are on the detector is in both program mode and
service mode. When the detector is in the service mode only, the
display will alternate between the sensor reading in PPM and “SEr”
(service mode indication). This is done as a reminder to return the
detector to normal mode. When in “PORGRAM and SERVICE”
mode “Ser” will not flash on the display.

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T
Th he e “ “E EN NT TE ER R” ”, , “ “U UP P” ”, , a an nd d “ “D DO OW WN N” ” P Pu us sh hb bu ut tt to on ns s
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.
R
Ro ot ta ar ry y S Se el le ec
ct to or r S Sw wi it tc ch h
The rotary selector switch (labeled “MENU SELECT” on the panel-
mounted circuit board) is used for performing functions such as:
•Setting the information displayed on the front panel
•Programming set points
•Displaying system information
•Calibrating the detector
When the detector is in operation, this switch is typically set to
position “0” to continuously display the ammonia concentration.
FIGURE 4

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Use the following chart to select the switch position for the desired
function:
To:
Set the Rotary Selector
Switch to:
See Page #
Display ammonia concentration in PPM
0
-
Display ammonia concentration in PPM
1
-
Display the firmware revision
2
-
Program the ammonia High alarm set point
3
14
Program the ammonia Low alarm set point
4
14
Display ammonia concentration in PPM (See Section Testing your system)
5
17
Factory Use
6
-
Factory Use
7
-
Display Electrochemical Sensor Zero offset
8
-
Factory Use
9
-
Note: If the rotary selector switch is left in a position other than “0”
without pushing an “UP” or “DOWN” button for more than 5
minutes, the digital display will begin to display ammonia
concentration. If this happens, return the selector switch to the “0”
position, then set the switch to the desired position. For example, if
you set the rotary selector switch to position “3” to program the
alarm set point, and if, after 5 minutes of inactivity the display
reverts to displaying ammonia concentration. Move the switch to
“0”, then back to “3” to continue programming the alarm set point.
Caution: Before closing the detector enclosure, be sure to
return the rotary selector switch to position “0” to
correctly display ammonia concentration.
Additional functions are available through the rotary
selector switch when the detector is in program mode
(program LED on).
To:
Set the Rotary
Selector Switch to:
SEE PAGE #
Display ammonia sensor temperature (Solid State Sensor Only)
1
-
Zero adjust for the Electrochemical sensor
2
18
Program the ammonia sensor 4 – 20mA Range
3
15
Set the Service Mode Time out
4
16
Factory Use
5
-
Factory Use
6
-
Set the Display start value. 0PPM, 10PPM, or 25PPM
7
14
Select for Solid State Sensor or Electrochemical Sensor
8
-
Calibrate the detector
9
18