Model: PG-2000
pg2000capum45.DOC Rev: 4.5
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1.0 INSTRUMENT OVERVIEW
1.1 FEATURES
• Automatic scanning of up to 80 EC Gold network sensors.
• Sensors may be assigned to any of 8 zones
• Optional: two 4-20mA outputs per zone to reflect the zone’s max. and average ppm
• Differential (dual threshold), independent, High-High, High, and Low alarms per zone.
• Alarm thresholds may be independently set for up to 4 gases.
• Optional 4 integral SPDT 10A relays plus up to 2 Auxiliary relay cards with up to 8 relays each.
Each relay is user selectable to be linked to any combination of 24 alarm sources: High-High,
High and Low alarms for all 8 zones. Relay1 can be designated for System Fault Alarm.
• Standard Buzzer output linked to common High-High alarm, with Acknowledge input or mA
output for highest ppm level in place of buzzer (must request at time of order). Each Auxiliary
relay board also has a buzzer output and acknowledge input.
• Independent Delay to On and Off for all installed relays
• Delay to ON for buzzer alarm
• RS-485 Modbus protocol to communicate with the EC Gold sensors
• Optional 2
nd
RS-485 link to Building Monitoring & Control System (BMCS)
• Front panel LCD and membrane keypad user interface.
1.2 DESCRIPTION
The CAP unit is field configured for the number of zones (up to 8) and sensors per zone.
Using the above setup information, the CAP unit continuously scans all the EC Gold transmitters for
their gas type and measured concentration. Up to 4 gas types are supported. For example, the CAP
may be configured to monitor Carbon Monoxide, Carbon Dioxide, Nitrogen Dioxide, and Methane.
The Low, High, and High-High alarm values are independently entered for each gas. A zone Low
alarm is triggered if the concentration of any of the target gases in that zone exceeds the Low alarm
value for that gas. There are a total of 24 possible alarms: Low, High, and High-High alarms per
zone for up to 8 zones.
The CAP supports 4 integral relays plus up to 2 Auxiliary boards each with 8 relays for a total of 20
relays. The CAP communicates with the Auxiliary boards via RS-485 / Modbus. The Auxiliary
boards may therefore be located conveniently to where they are required to reduce electrical wiring.
Each of the 20 relays may be independently mapped in the field to any of the 24 alarms (Low, High,
High-High for up to 8 zones). For example, Relay1 may be mapped to zone 1 Low Alarm as well as
the High Alarm for zones all other zones. Relay2 may be mapped to zone 2 Low Alarm as well as the
High Alarm for zones all other zones. This scheme will turn on the individual relays 1 and 2 when
their respective zones go into Low alarm, and both relays will turn on when any zone goes into High
or High-High alarm. This flexibility ensures efficient use of the relays, which can be tailored to unique
system requirements.
The common Trouble alarm is set if any EC Gold transmitter has a fault, or does not respond on the
network. Relay1 can be designated the common Trouble alarm relay.
Independent Delay to On and Delay to Off can be set for each relay.
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