In-situ, multi-component UV emissions analyser

Instrument Overview

Procal 5000 is an ultra-violet (UV), continuous emission monitoring analyser, designed for in-situ analysis of gas-phase emission components. Using absorption spectroscopy, Procal 5000 stores and analyses the full UV spectrum and calculates the gas emission concentrations.

A typical system comprises an in-situ analyser, an integral calibration function and a Control Unit. Procal 5000 uses the reflective beam principal to directly measure process gas as it enters the in-situ sample cell. Unlike higher maintenance extractive systems, Procal´s patented, sintered metal technology removes the need for gas filtering or sample conditioning. Maintenance is minimised by an integral zero and calibration point gas capability and frequent calibration checks which can be undertaken without intervention, enabling automated legislative compliance.


Principles of Operation


he Procal 5000 analyser uses a single beam of UV light from a long-life deuterium arc lamp. The beam is split and directed into a folded beam cell assembly before returning to fall on to a 1024 bit diode receiver array. A narrow region of the spectrum is measured by each diode and the spectrum is logged as a vector intensity enabling gas concentrations to be calculated. Up to six gas-phase component concentrations can be monitored simultaneously. Uniquely, the operation, zeroing and calibration are “fully challenged” in that all operating modes use the same optical path and system components.


The Procal 5000 analyser has been in service for over 15 years with continual product improvement to match ever-tightening legislative requirements


  • Multi-component gas analysis
  • Direct in-situ measurements
  • Automatic signal verification and recalibration
  • Oxygen or CO2 measurement normalisation
  • Flange mounted analyser
  • Low maintenance


  • Each Procal 5000 can monitor multiple gas concentrations.
  • No requirement for high cost, high maintenance sample handling system or sample conditioning.
  • No operator intervention during routine use.
  • Report measurement corrected to normalised O2 or CO2 reference conditions.
  • Reduced cost and simple of installation.
  • Reduced cost of through life ownership

Monitoring Range

Gases measured: Series of gas concentrations as determined by the application


Control Unit Options

Analyser Control Unit – Procal 1000 range

The Procal 1000 data logging and control system can be either stand-alone or Microsoft Windows based. The system is capable of controlling up to six, widely dispersed, Procal analysers of any design. The Procal 1000 range is also designed to accept signal I/O from other instruments in the process to provide a single CEMS data hub. The Procal 1000 system displays gas concentrations and third party analyser I/O along with information on sample conditions, diagnostic data and trends. The information can also be made available to external systems in a variety of industry standard data protocols.

Special Features:

  • Low cost through-life ownership
  • 1024-bit spectrum resolution

Principle of operation:
Ultra-violet absorption full spectrum method

Spectral range:

180nm to 400nm

Ultra-violet source:

Extended life deuterium lamp.(typically 7000 hrs)

Ultra-violet detector:

Miniature 1024 bit photo diode array

Sample path length:
1 metre. (Other lengths on application.)


Minimal due to full spectrum principle and advanced algorithms in the processor software

Pressure compensation:
To allow for atmospheric/stack pressure variation

Typically ±2% of full scale concentration but dependent on application

Response time:
Application dependent but typically 120 seconds to T90

Calibration Requirements:
Supplied pre-calibrated. Short term drift of less than the quoted accuracy is removed by zero
calibration, carried out automatically, typically every 24 hours depending on application.

Aluminium alloy casting with high protection finish, sealed to IP65 NEMA 4X. Outer GRP weather

Operating environment:

-20°C to +45°C (-4°F to 113°F). Ducted air provision for extreme temperatures. Sample
temperatures up to 400°C (750°F) (higher temperature on application).

Materials in contact with sample:

Calcium fluoride, glass, 316 stainless steel, graphite and fused silica

Services required:
90-250V 80VA required for lamp PSU, head cooler fan (application dependent) and electronics.
Instrument air for the analyser void purge, autozero and sample cell protection, controlled by the
Procal 5000. Pressure 2.5-3 barg; flow rate 1litre/min constant, regulator takes up to 10 bar but
set to 2 barg to give correct flows as auto-zero unit flow is pre-set for intake of 2 bar.

Mounting flange:

3” 150lb (note this is a special flange part number 4-1114)

35kg (77.2lb)

1544mm (60.78”) x 492mm (19.37”) x 410mm (16.14”)


Manual ???

e-mail confirmation

MLU core region