REV 0, June 2005 Page 173
Operation Manual SUPREMA
6. Startup
The signal Uy can be measured against GND (black test jack) at the test point MP/Uy at passi-
ve sensors. Uy is the sensor signal measured with a constant factor. It serves for the judgment
of the sensor sensitivity.
Attention: Do not yet connect sensor!
The sensor setting is made by means of an equivalent sensor circuit in order to avoid inadvertent
damage or destruction of the sensor by a too high bridge current. The MSA sensor simulation
module corresponding to the sensor type can be used for this purpose. If it is not available, an
equivalent sensor circuit can be realized by means of a MAT connection plug, wire resistors
and wire bridges according to
figure 6-9: Equivalent sensor circuit for the MPI-WT100/MPI-
WT10 module or figure 6-10: Equivalent sensor circuit for the MPI-HL8101/MPI-HL8113 module.
• Connect equivalent sensor circuit to the measuring points to be adjusted
• Connect digital multimeter to the test jacks of the MAI module (red/black), and select
the 3 V DC measuring range
• Activate the operation keys (UP, DOWN, MS) by pressing the SEL key
• Select measuring point by pressing the MS key; per keystroke a measuring point
further is switched, the selected measuring place is shown by the front LED row
(topmost LED = measuring point 1, undermost LED = measuring point 8); the LED of the
selected measuring point is shining green.
• Select the IBR function (bridge current) by pressing the SEL key (LED IBR is shining/
red)
• Adjust the bridge current provided for the sensor (± 1%) by pressing the buttons UP
or DOWN (see data sheet of measuring head resp. operation manual sensor) Note: the
voltage in mV being on at the test jacks corresponds to the adjusted current in mA ( e.g.
270 mV = 270 mA).
Repeat these steps for all passive sensors to be connected.
Deactivate the operation keys (UP, DOWN, MS) by pressing the SEL key repeatedly (until the
LED of the selected measuring point and the function LED are extinguished).
After this remove short-circuit bridge (terminal 2/terminal 4) and connect sensor cable. After
connection of the sensors we recommend to check again and to correct if necessary the bridge
current for every particular sensor.
6.3.4.2 Presetting of Zero/Sensitivity
After a sufficient warmup time of the sensors which is sensor and measuring component
dependent (see respective sensor operation and maintenance manual), a gas technical
presetting must be carried out at the MAI module for passive sensors.
Note: For the presetting performance, at least 2 persons are necessary. If the
SUPREMA is not situated within hearing range of the installed sensors, then the
use of a set of adequate radio equipment is in addition recommended to avoid
incorrect calibrations.
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