Oxigraf, Inc. - O2iL and O2iC Oxygen Process Analyzer

Search Catalog



	All Categories O2iL and O2iC Oxygen Process Analyzer

All Categories > Oxygen Analyzers by Products > O2iL and O2iC Oxygen Process Analyzer > Compare Items


	Compare Items
	Check one or more items to request information.


	larger image		O2iL and O2iC Oxygen Process Analyzer Now you can control oxygen process gas, combustion oxygen mixtures, or nitrogen purge gas with a response time of less than 1 second. Here is a truly digital oxygen analyzer with analog and digital interfaces for control, display, and data-logging of oxygen process parameters The Oxigraf O2iL may be the process controller you need. Fast response Reliable laser diode technology Pressure and temperature correction Remote display and maintenance Insensitive to movement Coded password access Sample flow monitor

Items

07-0194
O2iL Oxygen Process Analyzer

07-0272
O2iC Oxygen Process Analyzer

Fast Response

Modern process control requires fast response without overshoot. The Oxigraf Process Controller responds in less than a second. The transit time of the gas sample through the sampling tube may be 1 second per meter of sampling tube. To respond within 5 seconds, a monitor with a 1 second response time would need to be placed within 4 meters of the potential hazard. Electrochemical sensors may incorporate long averaging times, 20 or more seconds, for large, abrupt changes in oxygen concentration. Laser diode technology offers short response times to meet your control requirements.

Sample Flow Monitor

The Oxigraf O2iL includes a sampling pump, hydrophobic filter, and flow sensor. The microprocessor controller maintains the flow at a constant value. Any flow blockage or pump failure is reported as a low flow fault. Filter impedance can also be measured to indicate a need for filter maintenance. Thus remote monitoring of the flow system is enabled. Pumps are available to provide sampling at atmospheres down to 200 Torr.

Temperature, Pressure and Humidity

An error budget must be established for oxygen process control. Humidity changes can cause a large variation in the oxygen measurement. A hot, wet day relative humidity of 50% at 37ºC (99ºF) corresponds to an absolute humidity of 3.2%. Such a water vapor dilution would cause a variation from the cold, dry air oxygen concentration of 20.9 to 20.2%, a change of 0.7%. If 19.5% is to be the alarm value, then variations from all other sources must be substantially less than 0.7% (the difference between 19.5 and 20.2%).

Therefore, temperature and pressure corrections are important. An oxygen sensor which measures oxygen partial pressure instead of concentration would report an oxygen variation of 2% with a 10% variation in barometric pressure. The Oxigraf sensor is corrected to within ±0.2% over pressure changes of 50% and temperature changes from 0 to 50ºC.

Remote Display

The Oxigraf Process Controller includes various communication outputs of oxygen concentration, alarms, flow, and system status. It is essential for cost effective process control to have both local and remote indication of process control operation. Another advantage of a remote display we call “remote maintenance”. A major cost of oxygen process controllers is the requirement for periodic maintenance and recalibration. With remote maintenance, site service and recalibration are no longer required to be periodic. Any system, power, flow or measurement faults will be flagged on a remote display, and service and calibration can be performed on an as-needed basis. For example, choosing an average oxygen concentration in humid air of 20.7%, the central monitor might flag measurements outside a range from 20.2 to 21.2% as requiring a calibration visit; with such a remote maintenance protocol, a periodic calibration frequency might be annual or less frequent.

Tunable Diode Laser Spectroscopy

The Oxigraf O2iL is the next generation oxygen process controller. Laser diode absorption spectroscopy assures stable, long-life oxygen measurement: there are no electrochemical cells to replace or paramagnetic sensors to recalibrate. The laser diode, derived from high reliability telecommunications VCSEL (vertical cavity surface emitting laser) diode technology, is rated for more than 100,000 hours mean time to failure. The laser diode is thermally and electronically tuned to measure the absorption of oxygen at 763 nm, and also periodically measures the background to provide an automated zero. Pressure and temperature corrections are made to yield the correct oxygen concentration as the weather changes.

Insensitivity to Movement

The Oxigraf technology has no moving parts, in contrast to paramagnetic technology. Laser diode technology will have no false alarms due to equipment vibration, mechanical accidents, or even earthquakes.

Code Access

Control of the unit via the 12-key capacitive-touch panel can be restricted by use of a password. This permits access control for maintenance and unit calibration.

Measurement Range

2-100% (O-100% optional)

Accuracy

±0.2%

Cross Sensitivity

0.2% oxygen/nitrogen mixtures

Response Time

500 ms at 200 ml/min flow rate, additional low pass filtering programmable.

Gas Inlet Temperature

-20 to 60 ºC

Gas Pressure

200 to 1150 Mb

Humidity

0 to 95%, non-condensing

Warm-up Time

5 minutes

Display Resolution

0.01% O2

Analog Output

4 to 20 mA (max 750 ohm load), range programmable

Serial Outputs

RS232 (TXD, RXD, Ground), RS485 Modbus compatible

Relays

SPDT, 5 Amps, 115 VAC or 24 VDC
Terminal strip

Limit Relay 1

Programmable low limit or high limit, failsafe on/off

Limit Relay 2

Programmable low limit or high limit, failsafe on/off

Low Flow Relay

Active if sample flow problem

System OK Relay

Programmable failsafe on/off

Power

15 to 32 VDC, 1.5 A max, 0.6 A typical
Terminal strip

Display

16 x 2 character VFD, 8 mm character size

Optional Strobe

Red lens flashing strobe

Optional Horn

100 dB

Outside Dimensions

300 x 250 x 165 mm

Conduit connection

3/4 EMT x2 (supplied by the customer)

4-20 mA Connection

Terminal strip

RS232 Serial

Terminal strip and connector (Switchcraft EN3P3F)

RS485 Modbus Connection

Terminal strip

Pneumatic Interface

Diaphragm pump to 250 ml/min at 1010 mbar. Optional vane pump for use down to 100 mbar. PTFE inlet filter blocks condensate: any condensate must gravity drain down to the source.

Altitude Change

If the altitude of operation of the sensor changes by more than 2000', two-point recalibration is required.

Enclosure

Field Replaceable, unbolts with four screws. Electrical connections to a terminal board. Pneumatic connections slipfit or o-ring quick connects.
NEMA 4X rated non-metallic box with Lexan window, wall mounted. Class 1, Division II purged optional

Auto-Calibration

Auto Calibration is now standard for the absolute highest accuracy and the ultimate in ease of maintenance of your Oxigraf oxygen deficiency monitor. Connect to a cylinder of calibration gas or run tubing to a space where ambient air is known. Set the calibration interval to your specifications, and you will never need to worry about routine calibration maintenance. One point calibration is standard and two (2) point auto calibration is available as an option.