The measuring principle is based on the different thermal conductivity of gases.
The CALOMAT 6 sensor is a micromechanical-made Si chip with a measuring membrane and thin-film resistors.
The resistors are adjusted on a constant temperature. This requires an current intensity depending on the sample gas thermal conductivity. Further this „coarse value“ is electronically processed and used to calculate the gas concentration.
The sensor is located in a thermostatically-controlled stainless steel enclosure in order to prevent influences of ambient temperature changes.
To prevent the influences by the sample gas flow changes, the sensor is not placed in the main flow.
Note
The sample gas needs to be free of dust. Condensate (dew point of sample gas < ambient temperature) in the cells must be avoided. That is why the most measuring tasks require an appropriate gas preparation.
CALOMAT 6, mode of operation
Special characteristics
Four freely-progammable measuring ranges, also with zero offset, all measuring ranges linear
Smallest spans up to 1% H2 (with suppressed zero: 95 to 100% H2) possible
Electrically isolated analog output 0/2/4 to 20 mA (also inverted)
Autoranging or manual range switching possible; remote switching is also possible
Storage of measured values possible during calibration
Time constants selectable within wide limits (static/dynamic noise suppression); i.e. the response time oft he analyzer can be matched to the respective application
Short response time
Low long-term drift
Measuring point selection for up to 6 measuring points (can be parameterized)
Measuring range identification
Measuring point identification
External pressure sensor for correction of pressure variations in sample gas
Automatic range calibration can be parameterized
Operation based on NAMUR Recommendation
Two operation levels with separate access code to prevent unintentional and unauthorized inputs
Simple handling using a numerical membrane keypad including operator prompting
Customer-specific analyzer options such as e.g.:
Customer acceptance
Tag labels
Drift recording
Clean for O2-Service.
Spans
The smallest and largest spans which are possible depend on the measured component (type of gas) as well as the respective application.
The smallest possible spans listed below refer to N2 as the residual gas. With other gases which have a larger/smaller thermal conductivity than N2, the smallest possible span is also larger/smaller.
Component
Smallest possible span
H2
0 ... 1% (95 ... 100%)
He
0 ... 2%
Ar
0 ... 10%
CO2
0 ... 20%
CH4
0 ... 15%
H2 in blast furnace gas
0 ... 10%
H2 in converter gas
0 ... 20%
H2 with wood gasification
0 ... 30%
Influence of interfering gases
Knowledge of the sample gas composition is necessary to determine the influence of residual gases with several interfering components.
The following table lists the zero offsets expressed in % H2 resulting from 10% residual gas (interfering gas) in each case.
Component
Zero offset
Ar
-1.28%
CH4
+1.59%
C2H6 (non-linear response)
-0.04%
C3H8
-0.80%
CO
-0.11%
CO2
-1.07%
He
+6.51%
H2O (non-linear response)
+1.58%
NH3 (non-linear response)
+1.3%
O2
-0.18%
SF6
-2.47%
SO2
-1.34%
Air (dry)
+0.5%
For residual gas concentrations differing from 10%, the correspondant multiple of the table value gives an acceptable approximation. This is valid for for residual gas concentrations up to 25% (dependent on gas type).
The thermal conductivity of most gas mixtures has a non-linear response. Even ambiguous results, such as e.g. with NH3/N2 mixtures, can occur within a specific concentration range.
In addition to a zero offset, it should also be noted that the gradient of the characteristic is influenced by the residual gas. However, this effect is negligible for most gases.
In case of correction of the influence of interfering gases with additional analyzers (ULTRAMAT 6/ULTRAMAT 23), the resulting measuring error can – depending on the application – amount up to 5% of the smallest measuring range of the application.
Example interfering gas correction
Specification of the interface cable
Characteristic impedance
100 ... 300 ?, with a measuring frequency of > 100 kHz
Cable capacity
typ. < 60 pF/m
Wire section
> 0.22 mm2, corresp. AWG 23
Cable type
twisted pairs, 1 x 2 wire of cable section
Signal attenuation
max. 9 dB over the whole length
Screening
copper braid shield or braid shield and foil screen
Connection
pin 3 and pin 8
Bus terminating resistors
The pin 3-7 and 8-9 of the first and last connector of a bus cable have to be bridged (see figure).
Note
It is advisable to install a repeater on the device side in case of a cable length increasing 500 m or of high interferences.
Up to four components can be corrected via ELAN bus, a cross correction can be effected for up to two components via analog inlet.
Bus cable with connector assignments
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