Analytical-industries GPR-35 Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 11)

Advanced Instruments Inc.

Electronics

The signal generated by the sensor is processed by state of the art low power micro-processor based digital circuitry. The first

stage amplifies the signal. The second stage eliminates the low frequency noise. The third stage employs a high frequency filter

and compensates for signal output variations caused by ambient temperature changes. The result is a very stable signal.

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.

Power for the on-line analyzers is supplied by an integral universal 100/110/220/230VAC power supply that is backed up by a

standby rechargeable lead acid battery that in the event the AC power is interrupted provides enough power to operate the unit

continuously for 8 hours in the alarm mode. Note: compliance with CE certification requires the installation of power and signal

output cables through separate metal conduit. Connections of the appropriate AC line voltage are made with either standard

computer type power cords through a universal power entry module.

In compliance with OSHA specifications, the standard is configured with 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

) and DANGER (19.5% O

). 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 is 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.

A certified span gas is recommended for calibration purposes. A Calibration Flow Adapter (see

illustration in section 2) is supplied with the GPR-35 and provides a barbed hose connection

for piping the calibration gas (see positive pressure see below) to the sensor, an o-ring seal to

isolate the sensor from the atmosphere being monitored and outlet to vent the calibration

gas.

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. Advanced Instruments Inc.

offers a full line of sample handling, conditioning and expertise to meet your application requirements. Contact us at 909-392-

6900 or e-mail us at [email protected]

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Analytical-industries GPR-35 Oxygen Analyzer Manuel d'utilisateur Page 11