| The versatile
Model 4500 Mark II is a dual-pass transmissometer that offers a reliable and effective
solution to the problem of dust measurement in industrial flue gases.
With no moving parts, the optical measuring system of the Model 4500 is extremely
reliable. The patented 'Flood LED' technique enhances the stability of this instrument by
compensating for any drift in the photo-electric detectors.
The Model 4500 Mark II wholly complies with the latest EPA performance specifications (CFR
40 Part 60, App. B, PS-1).
Features:
An electronically modulated (LED) light source
No moving parts during measurement cycle
Automatic zero and span calibrations
A patented flood technique for continuous photo-detector compensation
Zero sensitivity to changes in ambient light
Automatic measurement and correction of optical contamination
Simultaneous opacity and dust monitoring capability
A built-in calibration audit filter fixture (zero-jig)
Independently configurable analog outputs
Instrument status and exceeding limit relays
RS232 / RS422 / MODBUS interface
Continuous and comprehensive self diagnostics
Specifications:
| Transceiver & Retro-Reflector |
|
| Technique |
Dual Pass Transmissometer |
| Wavelength |
565 ± 20 nm |
| Light Source |
High Intensity LED (lifetime > 5 years) |
| Accuracy |
± 2% Opacity |
| Repeatability |
± 0.5% Opacity |
| Resolution |
0.1% Opacity |
| Drift |
< 1% per month |
| Angle of Projection |
< 2 degrees |
| Angle of View |
< 2 degrees |
| Response Time |
< 1 second to 90% of final value |
| Operating Temperature |
-20º to +55º C Standard (standard) |
| Max.Flue Gas Temperature |
+600º C (standard) |
| Measurement Pathlength |
0.7m - 10.0m (standard) |
| Local Control Unit (LCU) |
|
| Output Range |
0 - 5% to 100% (selectable in 1% increments) |
| Display |
2 x 16 character LCD |
| User Interface |
Tactile membrane keypad with password
protection |
| Available Measurements |
Opacity, transmission, optical density
(extinction) or dust (as mg/m3) |
| Outputs |
4 - 20mA (individually isolated) |
| Averaging |
Selectable from 1 to 59 minutes or 1 to 24
hours |
| Calibration |
On-board zero and upscale calibration function.
Automatically initiated by software (selectable interval 0 to 48 hours) and/or via remote
trigger input |
| Calibration Alarms |
Indication of excessive zero drift, span drift,
and optical contamination |
| Relays |
6 isolated changeover relays (240VAC - 1A or
24VDC - 5A) for: high opacity 1, high opacity 2, malfunction, maintenance, zero
calibration in progress, span calibration in progress |
| Indicators |
LEDs for power on, system OK, calibration in
progress, calibration error, maintenance in progress, opacity limits, optical
contamination threshold, air purge failure |
| Accessories |
Single or dual blower air purge units,
weatherhoods, NIST traceable calibration filters. |
|
