Siemens ULTRAMAT 23 User manual

© Siemens, All rights reserved Ⓟ 2009, 2010, 2012
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Continuous Gas Analysis
ULTRAMAT 23
Supplement 1 for Operating Instructions
C79000-G52xx-C216-03
Product Information
Introduction
Device model and validity
This supplement describes the device, ULTRAMAT 23 with a hydrogen-sulphide sensor. The supplement only covers the
specific components of this ULTRAMAT 23 version.
The standard operating instructions for the ULTRAMAT 23 (C79000-G52xx-C216) as of revision 03 should be read in any
case to ensure safe operation of this device. This applies, above all, to the warnings and safety information provided there.
Safety information
Safety information
You can find additional specific safety information in the respective sections of these operating instructions. Adherence to
these instructions is essential for safe handling of the device or situation described therein!
DANGER
Danger of poisoning
This device is designed to measure hydrogen sulfide and dihydrogen sulfide, H2S)!
Hydrogen sulfide is highly toxic even in small concentrations! The odor threshold for hydrogen sulfide is 0.02
vpm at (20 vpb). Persons exposed to this gas with concentrations up to 100 vpm for several hours demonstrate
poisoning symptoms such as fatigue, headache, loss of appetite and lack of concentration. With a
concentration from approximately 200 to 250 vpm, the olfactory receptors in the nose will be numbed so that
the odor is no longer perceived. Inhalation of H2S concentrations of 500 vpm longer than 30 minutes can cause
fatal poisoning. Concentrations above 1 000 vpm cause death within a few minutes, concentrations above
5 000 vpm cause death within a few seconds!
When using this device in plant where there may be high concentrations of H2S and you therefore need to take
following continual precautions to prevent the effects of poisoning:
● Connect the gas outlet of the analyzer to a gas exhaust unit so that no gas can escape into the
environment!
● Before you begin maintenance on the analyzer, make sure that the H2S concentration in the analyzer is
close to 0 vpm. Before beginning work, always flush the gas path of the analyzer and the gas sampler with
ambient air or nitrogen for a duration of about 10 minutes .
● Check for leaks in the analyzer at regular intervals!
DANGER
Danger of explosion
This device is used in biogas plants, among other places. When it is used in biogas plants, you should expect
that the sample gas will contain methane, which forms explosive mixtures with oxygen or air in certain
concentrations. These conditions are possible with certain operating states of the plant.
● To avoid the danger of an explosion, it is essential to install a flame arrester upstream of the analyzer in the
sample gas line of biogas plants.

Supplement 1 for Operating Instructions C79000-G52xx-C216-03
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Product information / technical updates
Description
Area of application
This device is designed to measure H2S.
Application areas include
● Biogas plants
● Sewage plants
● Drinking water treatment
● Feeding of biogas into the natural gas grid
Function
Measuring principle
The hydrogen sulfide enters through the diffusion barrier (gas diaphragm) into the sensor and is oxidized at the working
electrode. A reaction, the reduction of atmospheric oxygen, takes place on the counter electrode. A current which is directly
proportional to gas concentration results on the connector pins due to the electron transfer.
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Calibration of the measured value drift
The deflection signal of the sensor is subject to drift. This drift can be detected only through regular review and corrected as
needed. This involves using a calibration gas with a defined concentration of hydrogen sulfide. We recommend monthly
calibration (re-adjustment) with one of the following calibration gases (depending on the measuring range) to keep potential
measurement uncertainty within strict limits:
● 4 ... 40 vpm H2S
● 2 500 ... 3 000 vpm H2S

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Gas path charts
Key for gas path diagrams
1 Inlet for sample gas/calibration gas 10 Magnet valve
2 Gas outlet 11 Sample gas pump
3 Inlet for zero gas or
Inlet for sample gas/calibration gas (channel 2)
12 Pressure switch
4 Gas outlet channel 2 13 Flow indicator
5 Enclosure flushing 14 Analyzer unit
6 Inlet for atmospheric pressure sensor 15 Safety condensation trap
7 Inlet chopper compartment flushing 16 Oxygen sensor
8 Condensation trap with filter 17 Atmospheric pressure sensor
9 Safety fine filter 18 Hydrogen sulphide sensor
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Figure 2 ULTRAMAT 23, 19" rack-mounted enclosure with internal sample gas pump and optional oxygen
measurement

Supplement 1 for Operating Instructions C79000-G52xx-C216-03
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Figure 3 ULTRAMAT 23, 19" rack-mounted enclosure without internal sample gas pump, with optional oxygen
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Technical data
H2S sensor for measuring ranges from 500 to 5000 vpm H2S
General information
Measured components Maximum of 4, comprising three infrared-sensitive gases, one oxygen and
one hydrogen sulfide
Measuring ranges
Smallest measuring range
Largest measuring range
0 ... 500 vpm
0 ... 5 000 vpm
Service life of the sensor Approx. 12 months
Permissible ambient pressure 750 ... 1 200 hPa
Permissible operating temperature 5 ... 40 °C (41 ... 104 °F)
Operation mode Continuous measurement
AUTOCAL Cyclic interval any 3 hours using ambient air
Influencing variables
Associated gases The hydrogen sulfide sensor must not be used if the residual gas contains the
following components:
- Chlorine-containing compounds
- Fluorinated compounds
- Heavy metals
- Aerosols
- Alkaline components (e.g. NH3 >5 mg/m3)
Cross-inferences (interfering gases) 100 vpm SO2 result in a cross-interference of <30 vpm H2S
Drift < 1 % per month
Temperature < 3 % /10 K relative to full-scale value
Air pressure < 0.2 % of measured value per 1% pressure change
Measuring behavior
Display delay (T90 time) < 80 s with approx. 1-1.2 l/min sample gas flow
Output signal noise 3 % of smallest measuring range with a damping constant of 30 s
Display resolution 1 vpm H2S
Output signal resolution 1.5 % of smallest measuring range with a damping constant of 30 s
Reproducibility < 4 % of smallest measuring range, referred to full-scale value

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H2S sensor for measuring ranges from 5 to 50 vpm H2S
General information
Measured components Maximum of 4, comprising three infrared-sensitive gases, one oxygen and
one hydrogen sulfide
Measuring ranges
Smallest measuring range
Largest measuring range
0 ... 5 vpm
0 ... 50 vpm
Service life of the sensor Approx. 12 months
Permissible ambient pressure 750 ... 1 200 hPa
Permissible operating temperature 5 ... 40 °C (41 ... 104 °F)
Operation mode Continuous measurement between 0 and 12.5 vpm
Discontinuous measurement between 12.5 and 50 vpm
AUTOCAL Cyclic interval any 60 minutes using ambient air
Influencing variables
Accompanying gas The hydrogen sulfide sensor cannot be used if the accompanying gas contains
the following components:
- Chlorine-containing compounds
- Fluorinated compounds
- Heavy metals
- Aerosols
- Alkaline components (e.g. NH3 >5 mg/m3)
Cross-inference (interfering gas) 1 360 vpm SO2 result in a cross-interference of <20 vpm H2S
180 vpm NO result in a cross-interference of <150 vpm H2S
No cross-interference of CH4, CO2 and H2 (1000 vpm)
Drift < 1 % per month
Temperature < 3 % /10 K relative to full-scale value
Air pressure < 0.2 % of measured value per 1% pressure change
Measuring behavior
Display delay (T90 time) < 40 s with approx. 1-1.2 l/min sample gas flow
Output signal noise <2 % of smallest measuring range with a damping constant of 30 s
Display resolution 0,01 vpm H2S
Output signal resolution <1 % of smallest measuring range with a damping constant of 30 s
Reproducibility < 4 % of smallest measuring range
Note
Measuring ranges
The exact specification of the largest and smallest H2S ranges can be found on the label!

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Commissioning
General information
Commissioning of the ULTRAMAT 23 is described in section 4 of the standard operating instructions, C79000-G52xx-C216-
03. For the commissioning of the H2S channel, a special leak test needs to be performed, as it should be each time the H2S
sensor is exchanged.
Leak test of the H2S sensor
The leak test corresponds to that of other sample gas channels. It is most easily performed by connecting a U-tube
manometer to the sample gas inlet You can check for leaks as follows:
1. Block the sample gas outlet.
2. Create an overpressure of around 150 hPa (rel.) at the sample gas inlet.
3. Wait for about 60 seconds for the temperature of the incoming gas to be compensated.
4. Read the pressure on the manometer and note it
5. Wait a further 15 minutes and note the pressure again after this period.
6. Compare the two pressure values.
The sample gas path is sufficiently tight when the pressure has changed by no more than 5 hPa (5 mbar) over 15 minutes.
Operation
General information
Measuring mode
After power-on and a warming-up phase, the ULTRAMAT 23 a goes through an AUTOCAL. This involves synchronization of
the zero point and sensitivity of the two IR channels. When an oxygen sensor is used, its sensitivity is also compared with
ambient air with a proportion of 20.95% oxygen.
The hydrogen sulfide sensor is not adjusted during the course of this first AUTOCAL. The zero point of the H2S sensor is
only adjusted from the second AUTOCAL onwards.
Subsequently, the device enters the measuring mode and continuously measures.
Since a hydrogen sulphide sensor is used with this ULTRAMAT 23 model, the device can measure a maximum of 2 IR
components if an oxygen sensor is also being used at the same time.

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Operating mode
In operating mode, you can view device parameters or adjust the device and set the parameters.
This supplement only describes the functions relevant for operating the H2S sensor. A complete overview of all the device's
control functions can be found in the standard operating instructions of the ULTRAMAT 23 (C79000-G52xx-C216-03).
Press the ENTER key in measuring mode to start the operating mode. The main menu appears with the follow options.
Analyzer status
Calibration
Parameters
Configuration
Diagnostic control functions
H2S measuring capacity
To specify the value of the H2S measuring capacity, navigate as follow in the operator menu:
Diagnostics -> Analyzer status -> Measuring reserve - > H2S Measuring reserve.
The following screen appears:
H2S Sensor status
Reading :747,OOnA
Maint.Req.:373,50nA
Fault : 74,70nA
The H2S sensor ages with increasing operating time, thereby steadily decreasing its sensitivity. It has almost reached the
end of its service life (maintenance requirement) when it has lots 50% of its sensitivity. The sensor must be replaced. If the
sensitivity drops below 10%, error message S30 (sensitivity of H2S sensor outside tolerance limits) is output.
Diagnostic values
The displayed diagnostic values provide important information for troubleshooting and calibration tasks. To view the
diagnostic values of the H2S sensor, navigate as follow in the operator menu:
Diagnostics -> Diagnostic values -> Probe diagnostic values -> Choose component -> H2S.
The following screen appears:
Sensorsig.: 4886 nA
H2S : 6.5 vpm
Inst. Date: 05.11.2011
Inst Curr : 747 nA
This dialog shows the diagnostic values of the H2S sensor. They have the following meaning:
● Probe current is the current pressure-corrected current of the H2S sensor in nA
● H2S is the current hydrogen sulphide measured value in vpm. Negative values are also possible here.
● Date is the installation date of the H2S sensor
● Installation current is the pressure-corrected current per vpm H2S of the sensor at the time of installation.

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Calibration control functions
You first need to select the H2S sensor in order to adjust it. To do this, navigate in the operator menu as follows:
Calibration -> Please enter code -> Calibrate probe -> Choose component -> H2S.
The following screen appears:
Cal after install
Start zero cal.
Start MR cal.
Input TC parameters
Now you can adjust the sensor as described in the following sections.
The following sequence must be observed when calibrating the sensor:
1. Enter correction factors for temperature compensation of zero point
2. Enter correction factors for temperature compensation of sensitivity
3. Caibrate zero point of the H2S sensor
4. Caibrate measuring range of the H2S sensor
5. Enter installation date.
Steps 1, 2 and 5 are only carried out when installing a new sensor.
Enter correction factors of temperature compensation
You use this function to enter the temperature compensation parameters for calibration of the zero point and sensitivity.
To do this, navigate as follows: Calibration -> Please enter code -> Calibrate probe -> Choose component -> H2S ->
Calibrate TC parameters. The following screen appears:
TK Nullpkt. Eingabe
TK Empf. Eingabe
Temperature compensation of zero point
To do this, proceed as follows:
1. Position the cursor on the first line
2. Then press the ENTER.
button. The following screen appears:
A: -3.0817e+1
B: +2.2547e+0
C: -1.1450e-1
D: +2.8000e-3
You can now view the factors of the TC parameters for the zero point, and change them if necessary.

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Temperature compensation of sensitivity
To do this, proceed as follows:
1. Select the menu screen 'TC parameter input' (see above).
2. Position the cursor on the second line
3. Then press the ENTER.
button. The following screen appears:
A: +4.2117e+0
B: -2.8547e-1
C: +5.5450e-3
D: -2.8001e-5
You can now view the factors of the TC parameters for the sensitivity, and change them if necessary.
Adjusting the zero point
You can use this function to re-adjust the zero point of the H2S sensor. You can use nitrogen or air containing no H2S as the
zero gas.
To do this, navigate as follows: Calibration -> Please enter code -> Calibrate probe -> Choose component -> H2S ->
Calibrate Zero Point. The following screen appears:
H2S Zero cal.
3.3 vpm H
2
S
Nitrogen flow please
Calibrate with ENTER
Selecting this function switches from the sample gas inlet (inlet 1) to the zero gas inlet (Input 3). Now perform the zero point
calibration as follows:
1. Wait until the displayed value has stabilized.
2. Begin the correction of the calibration by pressing the ENTER key.
3. End the calibration by pressing the ESC key.
If an error is detected during the calibration, error number 29 is displayed (zero point of H2S sensor outside tolerance limits).