Instruction Manual
ExTox IMC-8/-4
Page 12 of 22
BA_IMC-8_-4_e_2019-12-17.docx
IMC-8D (IMC-4D)
Application
Digital Input E3
Status signal housing fans (
only allocated in systems with Flow-Meter,
see 6.1.2
)
Digital input E4
External activation of maintenance mode is not provided
5.2.4
Calibration and Adjustment
Calibration and adjustment of the biogas-types is only done via automatic control.
▪
Preparation
You have to enter the concentrations of the used calibration gases in the menu "System Param-
eter/Mode/Bio/Timer". On the right side of the display you could enter the concentrations for
CH
4
, O
2
, CO
2
and H
2
S. These values are necessary for automatic calibration. You will normally
find this information on the test gas bottle. In case the test gases are filled in different pressure
gas bottles, you have to follow the instructions following below for all used test gases. For cali-
bration of the O
2
-Measuring Channel you have to apply a test gas which does not contain any
oxygen.
▪
Course
You have to select the menu point "Calibration" 'in the menu "Setup". For that purpose you have
to activate minimum Access Level 2 before. The calibration menu appears and the internal mag-
netic valve switches to flushing air. In case the system should not be calibrated you could leave
the menu via "Esc". By means of "Start" the automatic calibration is started. The analogue out-
puts keep the measured values of the last measurement.
Calibration is done in five phases:
Phase Indication on Display
ET-8D-(ET-4D2-)
Course
1 RINSING
AIR
(RINS AIR)
The system is flushed with air for three minutes
2
READING ZERO
(READ ZERO)
The gas suction pump is switched off. The system waits one
minute until stabilisation of measured values. Then the
measured values are stored (zero point values for CH
4
, CO
2
,
H
2
S or 20.9 Vol.-% for O
2
).
3 RINSING
GAS
(RINS GAS)
The gas suction pump is switched on again and the system
is flushed with connected test gas for four minutes.
Attention:
Only during this phase the test gas bottle has
to be connected and the test gas has to be applied to the
IMC. The test gas has to be applied pressure less. It has
always to be ensured that an adequate test gas volume
stream is provided, that means on application of test gas
has to be set which corresponds to the one in measuring
operation
4
. This is to avoid that air is additionally sucked in
and dilution of the test gas resulting from this falsifies cali-
bration / adjustment.
4
READING SENSITIVITY
(READ SENS)
The measured gas pump is switched off and batch meas-
urement is done within two minutes.
4
Depending on type the necessary test gas volume stream may be considerably above the indicated volume stream.
