Analytical Industries GPR-2500 S Oxygen Analyzer - Manual (Page 10)

10
Sample oxygen is analyzed very accurately. Response time of 90% of full scale is less than 10 seconds (actual
experience may vary due to the integrity of sample line connections, dead volume and flow rate selected) on all
ranges under ambient monitoring conditions. Sensitivity is typically 0.5% of full scale low range. Oxygen readings
may be recorded by an external device via the 0-1V signal output jack.
A 4-20mA signal output is provided from a two-wire 12-36VDC loop power source such as a PLC and is represented
on full scale oxygen readings to an external device. When operated in conjunction with the manufacturer’s
recommended optional intrinsic safety barriers the GPR-2500S meets the intrinsic safety standards required for use
in Class 1, Division 1, Groups A, B, C, D hazardous areas.
In compliance with OSHA specifications, the standard unit includes two oxygen alarms which have been set by the
factory to energize audio and visual alarms when oxygen levels fall below CAUTION (20.0% O
2
) and DANGER
(19.5% O
2
). Optionally, these alarms can be configured as HIGH O2 and LOW O2 based on customer
requirements. The two-color alarm LED indicators display green for safe and red for alarm conditions. The alarms
remain energized until the oxygen level rises above (and/or below with the optional high, low configuration) the
alarm set points. Power interruptions do not interfere with the alarms of a unit installed and operated properly.
The GPR-35 is unique in that it automatically compensates the sensor output for pressure changes thereby
eliminating the false alarms. Unlike competitive analyzers the GPR-35 is not affected by changes in the barometric
pressure that can temporarily impact the sensor output and analyzer reading to the extent that most analyzers
produce false alarms. In addition to being irritating, false alarms can be costly in terms of interrupting projects,
tests or production processes.
Sample System:
The GPR-35 designed for in-situ ambient or area monitoring and has no sample
system because the sensor is intended to be exposed directly to the surrounding
ambient atmosphere which it is sampling and to operate at atmospheric
pressure, however, slightly positive pressure has minimal effect on accuracy.
Further, applications situations may dictate that the sample be transported from
a semi-sealed area to a safe area where the analyzer is located. In these cases
the analyzer can be readily adapted to include optional pumps, tubing and
connection fittings. Users interested in adding their own sample conditioning
system should consult the factory. Contact us at 909-392-6900 or e-mail us at
[email protected] with any questions.
Mounting the Analyzer
The GPR-2500S Ambient Oxygen Monitors has been calibrated at the factory prior to
shipment and is fully operational from the shipping container. The enclosure’s 4x9x3”
configuration is designed to be mounted directly to any flat vertical surface, wall or bulkhead
plate with the appropriate screws. To facilitate servicing the interior of the monitors, position
it approximately 5 feet off the floor.
1. Remove the four (4) screws securing the top section of the enclosure, set them aside for
reinstallation and raise the hinged top section 180º until it locks in place.
2. Locate the mounting holes cast into the bottom section of the enclosure and the black
sensor. Orient the enclosure by locating the sensor at six (6) o’clock.
3. Secure the bottom section of the enclosure to a vertical surface approximately 5 feet
from the floor or a level accessible to service personnel. This requires the user to supply
four (4) additional proper size screws and anchors.
4. Caution: Do not remove or discard the gaskets from either the enclosure or junction box.
Failure to reinstall either gasket will void the NEMA 4 rating and RFI protection.