Siemens SIPROCESS GA700 Operating Instructions

Measuring principle
The ULTRAMAT7 can simultaneously measure up to 4 infrared-active measuring components.
The measurements are based on the molecular-speci󹪝c absorption of infrared radiation
bands (absorption bands). ULTRAMAT7 analyzer modules use a spectral range which
includes wavelengths of 2to9µm. Although the absorbing wavelengths are characteristic
of individual gases, they may partially overlap. This results in cross-sensitivities which are
reduced to a minimum by the following measures:
• Beam splitter (gas 󹪝lter)
• Double-layer detector, each gas compartment with adjustable weighting between the 󹪝rst
and second detector layer
• Application-speci󹪝c factory-󹪝tted interference 󹪝lter
ULTRAMAT7 analyzer modules operate according to the infrared push-pull chopped radiation
principle and are equipped with a double-layer detector.
An IR source ① with a temperature of approximately 600°C generates infrared radiation
which is emitted in the beam splitter ③ . The beam splitter ③ acts as a 󹪝lter chamber and
divides the beam equally between the sample gas and reference gas compartments.
The chopper ④ produces a periodic modulation of the infrared radiation, and thus enables
relaxation of the receiver.
The reference beam passes through the reference chamber ⑤ and enters the detector
chamber ⑥ virtually unattenuated. The detector chamber ⑥ is 󹪝lled with a precisely de󹪝ned
concentration of the gas component to be measured.
The sample beam, by contrast, passes through the sample chamber ⑫ 󹪝lled with sample
gas and enters the detector chamber ⑩ attenuated to various degrees. The degree of
attenuation depends on the respective sample gas concentration.
The detector is designed as a double-layer detector. The detector layer at the source end
serves primarily to absorb the middle of the band. The band edges, however, are absorbed
equally by both of the layers.
The detector layers at both compartments of the detector are pneumatically connected to
each other via a micro󹪞ow sensor ⑨ . This sensor element converts the pressure di󹪜erence
in the detector into an electrical signal.
The weighting between the 󹪝rst and second detector layer is preset to a dew point of
4°C by default at the factory using the decoupler. This minimizes the e󹪜ect of interfering
components.
To ensure the long-term stability of the measured value, the ULTRAMAT7 analyzer module
supports the predictive self-diagnostics of the analyzer. This function enables you to plan
maintenance measures in a timely manner.
4.5.4 Reference gas monitoring
Only the device versions of the ULTRAMAT 7 with a 󹪞ow-type reference end are equipped with
reference gas connections. The reference gas connections are implemented as nozzles with an
outer diameter of 6mm.
Description
4.5ULTRAMAT 7
Wall-mounted device
36 Operating Instructions, 07/2023, A5E31930403-AB

Siemens SIPROCESS GA700 Specifications

General

Brand	Siemens
Model	SIPROCESS GA700
Category	Measuring Instruments
Language	English