44-00-0297 SHERLOCK102/202 REV. 4.1 05-02-1516
(Please see the diagrams in manual 44-0377 for more infor-
mation and the location of components.)
The SHERLOCK Ammonia (NH
3
) Electro-Chemical Cell
Refrigerant Gas Sensor was designed to monitor for the pres-
ence of Ammonia refrigerant gases within an enclosed space.
The sensor is mounted within the space to be monitored and
connected by cable to a SHERLOCK System. The Electro-
Chemical Sensor Cell comes in a NEMA 3R Grey plastic box.
(Pictured) or a NEMA 3R ABS Washdown Housing.
The Electro-Chemical Sensor Cell is a reliable method of
monitoring for a low level refrigerant gas leaks in environments
that have air quality problems. The Electro-Chemical Sensor
Cell sensor will eliminate many false alarms in environments
that contain gasoline, diesel, and propane exhaust and fumes
from solvents, paints, cleansers, and others (Please call Genesis
Customer Support for more information).
The LED on the front of the sensor remains lit when the sensor
is operating withing parameters. The LED will fl ash when the
sensor element needs to be changed. After changing the sen-
sor element, a push button on the sensor will reset the timer for
when the next time the element needs to be changed out.
APPLICATIONS
Typical applications include:
Refrigeration Mechanical Rooms
Refrigerated Rooms
Food Processing Plants
SPECIFICATIONS
ENCLOSURE RATING NEMA 3R ABS Gray Plastic,
DIMENSIONS Inches (mm)
STANDARD 6.88 x 3.58 x 2.13 (175 x 91 x 54)
NEMA 3R ABS 12.0 x 7.0 x 6.0 (305 x 178 x 152)
OPERATING ENVIRONMENT
TEMPERATURE
Machine Room Model 32°- 110°F (0°- 43.3°C)
STANDARD Part Number 82-0460
NEMA 3R ABS Part Number 60-0242
Freezer Room Model -40°- 110°F (-40°- 43.3°C)
STANDARD Part Number 82-0461
NEMA 3R ABS Part Number 60-0243
HUMIDITY 0 - 90% RH Non-Condensing
POWER INPUT 12VDC, 0.1 Amps
OUTPUTS Current Driven
EFFECTIVE RANGE 0 - 500 ppm
SENSITIVITY ±1 ppm at 77°F (25°C), 45% RH
RESOLUTION 1 ppm
RESPONSE TIME Under Than 20 Seconds
CALIBRATION Every 12 Months and after new
sensor cell is installed.
WARM-UP TIME Readings will stabilize in 30
Minutes
LIFE EXPECTANCY Average of 24 Months, Sensor
Cell can be Field Replaced
COMPONENTS DESCRIPTION AND USE
LED 2 - LED2 is the RED LED that is on the sensor main board.
It will fl ash every second when there is power to the board and
it is working properly.
PB1 (PUSHBUTTON 1) - After the new sensor is replaced,
PB1 is used to reset the life span timer. Hold the button down
for 6 seconds. The light will go out and after 6 seconds, it will
fl ash once. Let go of the push button. The LED should resume
fl ashing every second again. The sensor is ready for use.
POT1 - POT1 is on the upper board and does not need to be
changed. On the obsolete board it is the middle potentionmeter
on the board. It is used to set the new sensor span.
P5 (PLUG CONNECTOR 5) - P5 is a ribbon cable that con-
nects the lower board with the upper board. When replacing
a sensor element, this plug is disconnected from the top board
socket.
LED3 - LED3 is the 2 pin white plug that connects to the exter-
nal amber warning LED. When replacing a sensor element, this
plug is disconnected from this socket.
WARNING!!!! The Electro-Chemical sensor will
pick up all types of ammonia gas including fumes
from household cleaners containing ammonia and
is not to be applied into all refrigerated storage
applications where other toxic gases are used in the
same room. Some installations are not suitable for
Electro-Chemical technology. Misapplication may
result in damage to sensor. Contact the factory for
a specific list of approved applications.
ELECTRO-CHEMICAL NH3 SENSOR
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