36
ECS SMART Gas Analyzer SGA-1
Specifications
Stock Number: SGA-1
Sensor Type: Zirconium Dioxide
Electrical Connection: 120-240VAC, 50-60 Hz/.5A
24VDC/2A
Signal Output: 0-5VDC linear output
4-20mA linear output
Output Display: %O
2
or %N
2
Resolution: 1dp (nn.n%)
Accuracy: 1%
Sample Connection: 5/32” nylon tubing quick connect
Dimensions: 8” (W) X 10” (H) X 6” (D)
(203mm (W) X 254mm (H) X 152mm (D))
General Description
The ECS SMART Gas Analyzer (SGA-1) provides a continuous real-time monitoring of nitrogen/oxygen
concentration levels within a dry pipe and preaction fire sprinkler system. The analyzer samples discharge
gas from an adjacent Standard Vent (PAV-D/DQ) or SMART Vent (PSV-D/DE). The gas flows out of a
restricted orifice on the vent through pressure-rated tubing to provide slow, controlled flow to the
analyzer. One (1) SGA-1 analyzer is recommended with each Nitrogen Generation System.
The SGA-1 has many different functions. It is equipped with a programmable contact closure for one of
three different oxygen concentration levels (1%, 3%, and 5%), which will provide early warning to a user
when the nitrogen concentration within the fire sprinkler system falls below the desired level. The SGA-1
is equipped with an analog (0-5VDC, 0-10VDC, or 4-20mA) output and an RS-485 port for optional remote
control and monitoring. The SGA-1 can display either oxygen or nitrogen concentration.
The SGA-1 is equipped to protect itself from damage, and let the user know if the sensor is in poor health.
Five minutes after the sensor is powered on, it begins a self-diagnostic protocol. If at this time the oxygen
level is below .3%, the alarm relay will energize, and the sensor will automatically shut itself down. It will
reboot automatically after twenty-four (24) hours and resume reading gas concentration levels. Pumping
at extremely low oxygen levels can eventually cause damage to the sensor. If the sensor detects rapid
deviation in oxygen concentration it will signal an error and energize the alarm relay without shutting
down.
Installation Notes
1. When connecting the SGA-1 Gas Analyzer to a fire sprinkler system using the PAV-D/DQ Vent, a
dedicated PAV-D/DQ Vent is required to provide a continuous gas stream to analyze. The muffler
in the PAV-D must be removed and replaced with a 5/32” push-connect fitting. The PAV-DQ
includes the 5/32” push-connect fitting.
2. When connecting the SGA-1 Gas Analyzer to a fire sprinkler system using the PSV-D/DE SMART
Vent, the quick disconnect sampling port in the PSV-D/DE must be removed and replaced with a
5/32” push-connect fitting.
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