For on-line concentration monitoring

The OMA-300  is a diode-array fiber-optics process spectrophotometer, measuring the absorbance of a sample as a function of wavelength. It is constructed of a light source, a dispersion device to select a particular wavelength, a sample area, and a detector. The OMA uses a tungsten, xenon or deuterium light source (depending on application), a holographic grating to disperse the light according to its wavelength, a fiber optics probe to transfer the light to and from the sample and a diode array detector which converts the light intensity into electrical signal. A full spectrum is continuously measured and analyzed, via a multi- wavelength method, to give the composition of the stream.

The OMA-300 is designed to address on-line applications that require cost effective, accurate continuous concentration monitoring. A simple touch-screen based user interface is ideal for single and multi component analysis and allows for quick setup and calibration.
Wavelength ranges from 200-1,200 nm are continuously and instantaneously monitored by a diode array spectrophotometer with 2,048 elements. A nonvolatile memory section of the analyzer contains the calculation method, wavelength ranges and the name of the analyte to be displayed on the screen.
 

Standard outputs includes 4-20mA output and digital I/O’s. Since the analyzer incorporates Modbus communication protocol it can readily communicate with external physical devices such as PLCs, RTUs, and controllers. The OMA-300   is offered in two different enclosures: A 316 Stainless Steel enclosure and a Class I Division I Groups B, C &D NEMA 4X / 7 Cenelec approved enclosure. Two fiber optic cables are used to conduct light to and from the probe or flow cell. A variety of flow cells and probes with different optical paths and materials of construction are offered. The two standard sampling system designs are : an extractive aspirated system with a manual or automatic zero and span for gases and liquids, and a semi in situ / extractive stack sampler with flow indication and automatic span and zero. 

Applications include

Chlorine , hydrogen sulfide, sulfur dioxide, color, aromatics,

nitrogen oxide, nitrogen dioxide also:

• Hydrogen Sulfide
• Chlorine
• Chlorine dioxide
• Sulfur dioxide
• Nitrogen oxides
• Color
• Ozone
• Aromatics (BTX)
• Ammonia
• Metal ions
• Monitor specific wavelengths
• Interface detection
• Bromine
• Mercaptans

Features

• Accurate single or multi component concentration monitoring

• Solid state - Low maintenance

• Fiber optics probe- remote sensing

• Touch-screen display and user’s interface

• Turn key system for specific applications.

• 4-20 mA Outputs

• Modbus Ethernet TCP IP output

• Wide wavelength range for a variety of applications

• Easy to operate and maintain

 

Specifications

Repeatability:	± 0.5% of scale
Photometric accuracy:	± 0.004 AU
Operating conditions:
Temperature:	0 to 550C (320 – 1310F) standard -200 to 550C (-4 to 1310F) optional
Sample conditions
Immersion probe
Temperature	-200 to 1500C (-4 to 3020F)
Pressure	100 bar (1470 psig)
Flow through cell
Pressure	10 bar (147 psig) standard
Temperature	-200 to 1500C (-4 to 3020F)
Note	Wetted flow cell materials are: 316 stainless steel, K7 glass and Teflon. Other materials – optional
Area classification:
General purpose:	Standard
Class I Div. II Grp C&D	Optional
Analog Output:	One galvanically isolated 4-20mA (additional 2 – optional)
Fault relay:	One SPDT alarm relay , to be set by user
Power:	80 to 240 Volts AC 40 to 60Hz, 40 Watts.
Physical Dimensions:
Dimensions	16"(H) x 14" (W) x 8" (D) (41 x 36 x 20 cm)
Weight	32 lbs. (15 Kgs.)