Genesis SHERLOCK 102, Operation Manual

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44-00-0297 SHERLOCK 102/202 REV. 4.1 05-02-15 8
processed by the sensor circuitry to produce an analog output
signal, which is sent to the Control Module as the sensor read-
ing. The range is 0-500 ppm.
Oxygen Depletion Sensor
The SHERLOCK Oxygen Depletion Electro-chemical Sensor
utilizes a chemical cell to determine the concentration of
oxygen in the air. The chemical cell produces small chemical
reaction with oxygen molecules, thus producing a voltage drop
across the cell. When the concentration of oxygen changes,
the voltage drop across the cell changes. This change in volt-
age is processed by the sensor circuitry to produce an analog
output signal, which sent to the Control Module as the sensor
reading.
Alarm Level Settings
The SHERLOCK 2-Series allows you to set a unique Level
1 Alarm Setpoint and delay and Level 2 Alarm Setpoint and
delay for each individual sensor. These relays can be active
Normally Open (N.O.) or Normally Closed (N.C.). When an
Alarm Setpoint is exceeded, after the user set delay, corre-
sponding alarm relays are activated Each Alarm Setpoint has a
programable Alarm Delay, 1 to 120 minutes. Sensor readings
are required to exceed an Alarm Setpoint for the programmed
amount of time before the control activates the corresponding
alarm relay contacts. For example, if the Alarm Setpoint is
200 and the Alarm Delay is five minutes, the control will enter
an alarm condition only if the sensor detects a level of 200 or
higher for more than five minutes.
Alarm Indication
All alarms are logged to indicate which sensor went in and out
of any of the two alarm levels, the time and date of the alarm.
The alarm log stores the last 10 alarms. When a sensor is in
alarm, a red alarm light on the front panel will flash and the on-
board beeper will sound and the display will show the activated
alarm level.
Alarm Relay Contacts
The SHERLOCK 2-Series provides two fused SPDT (Single
Pole Double Throw) relay outputs for each alarm level that
switch positions in the event of an alarm condition. Level 1
Alarm activates #1 (REFR LEAK LEVEL 1) and #2 (REFR
LEAK LEVEL 1 SILENCEABLE) relays. Level 2 Alarm
activates #3 (REFR LEAK LEVEL 2) and #4 (REFR LEAK
LEVEL 2 SILENCEABLE) relays. One alarm relay on each
level can be silenced (returned to non-alarm state), (#2 REFR
LEAK LEVEL 1 SILENCEABLE / #4 REFR LEAK LEVEL
2 SILENCEABLE) when the ALARM CLEAR button on the
front panel is pushed. The other 2 alarm relays will remain
active until the alarm condition is cleared. The SHERLOCK
2-Series can be programmed so that the alarm is cleared auto-
matically when the air is cleared below the alarm setpoint
(UNLATCHED) The relays can also be programmed so the
alarm is latched “ON” until the alarm is manually reset. The
relays can be configured so the relays are "Energized to Alarm"
(where the C-NC contacts open on alarm) or "De-Energized to
Alarm" (where the relay is energized during normal operations
and the C-NC contacts close on alarm).
Zone isolation Alarm Relays (Factory Installed Option)
Optional zone isolation alarm relay (#5 SENSOR A ZONE, #6
SENSOR A ZONE SILENCE-ABLE, #7 SENSOR B ZONE,
#8 SENSOR B ZONE SILENCE-ABLE). Each sensor can be
programmed to activate by level 1 or level 1 & 2 alarm. One
relay is silenceable and one is non-silenceable. This is a factory
installed option and cannot be retro-fitted in the field.
Analog Signal Generator (Factory Installed Option)
The SHERLOCK 102 and 202 has an optional 4-20 mA analog
output generator for each sensor. Either of these signals can be
incorporated to any commercially used monitoring and alarm-
ing system or in-house Data Management System. This option
can only be installed in the factory and cannot be retro-fitted in
the field.
Systems Sensor Open Monitoring
The SHERLOCK 2-Series constantly monitors the wiring
to the sensors. Should any of the activated sensor wires be
cut or disconnected, “SENSOR ALARM” will appear on the
SHERLOCK display, the#1 (REFR LEAK LEVEL 1) and #2
(REFR LEAK LEVEL 1 SILENCEABLE) relays will be acti-
vated and the condition is logged.
Setback Alarm Settings
In some locations the sensor may be expected to function in two
different environments. For example, the sensor may have to
perform in still air (i.e. with the exhaust fan off) and in moving
air ( i.e. with the exhaust fan on), or the sensor may be used in a
location where changes in air quality, perhaps caused by the use
of propane powered floor buffers, elevates the sensor readings.
The SHERLOCK
2-Series provides a feature called SETBACK
to accommodate alternate environments under which the sen-
sor would operate. SETBACK provides a second ALARM
SETPOINT and a second ALARM DELAY enabling the sen-
sor to perform in this second environment. The SHERLOCK
2-Series switches to the second set of parameters when a dry
contact (i.e. air flow switch, sail switch or timer switch) closes
or on a daily time schedule.
Each sensor can be programmed with one of five SETBACK
options:
1) No SETBACK
2) SETBACK triggered by setback input 1 and the
Setback Clock
3) SETBACK triggered by setback input 2 only
Each sensor can be programmed with only one SETBACK
option; however, different sensors may be programmed to fol-
low different options.
Genesis International Inc. offers a variety of external alarms
for office use - A Remote Alarm, Remote Alarm with Strobe,
Automatic Alarm Dialer as well as for mechanical room use -
a Strobe Light and a combination Horn / Strobe as well as a
Stackable Beacon.
INTRODUCTION