Printed in USA 150313
Page 05
4 Electrical Connection
Consider static electricity! See 3. Mounting
•
Installation of the electrical wiring should only be performed by a trained specialist according to the
connection diagram, without any power applied to conductors and according to the corresponding
regulations!
•
Avoid any influence of external interference by using shielded cables for the signal line, but do not
connect the shield.
•
Recommended cable analog mode: (20 AWG), max. res. 73
Ω
/km (20.8
Ω
/1000 ft).
•
It is important to ensure that the wire shields or any bare wires do not short the mounted PCB.
4.1 Wiring Connection
•
Open the cover. Unplug basic PCB carefully from terminal blocks at X4 and X5.
•
Insert the cable, connect cable leads to terminal blocks. See fig. 1 and 2.
•
Replug the PCB in the terminal blocks X4, X5. Replace cover.
5 Commissioning
Consider commissioning instructions at any exchange of sensor elements.
Only trained technicians should perform the following:
•
Check mounting location.
•
Select output signal form: Current or voltage, and starting point 0 or 20%. See fig. 4.
•
Check power voltage.
•
Check PCB AT-33XX V3 for proper mounting at X4 and X5.
•
Check the sensor for proper mounting at the connectors X8 of the PCB AT-33XX V3 (only AT-34XX
V3).
•
Calibrate the transmitter (if not already factory-calibrated).
Required instruments for commissioning (calibration) of the transmitter:
•
Test gas bottle with synthetic air (20 % O2, 80 % N).
•
Test gas bottle with test gas (methane etc.) in the range of 30 – 60 % of the measuring range.
•
Gas pressure regulator with flow meter to control the gas flow to 150 ml/min.
•
Calibration adapter with tube, (silicon-free, e.g. Viton). Calibration set CALKIT-AT. See fig. 06.
•
Digital voltmeter with range 0 – 10VDC, accuracy 1% and a small screwdriver.
Note:
Prior to calibration the sensor element must be fully stabilized by applying power voltage for at least 4
hour without interruption.
Please observe proper handling procedures for test gas bottles (regulations TRGS 220)!
Attention:
Combustible calibration gases are toxic, never inhale the gas!
Symptoms: Dizziness, headache and nausea.
Procedure if exposed: Take the victim into fresh air at once, call a doctor.
Specifications subject to change without notice. | USA 151203 | Page 5 of 14
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AT-3300_V3 – UserManual
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