Special Conditions X - Mettler Toledo InPro 7250 Series Bedienungsanleitung

®
InPro 7250 Series
3. The conductivity measuring circuit and the tempe-
2.5.3.

Special conditions X

1. The maximum permissible process temperatures are
Temperature class
T6
T5
T4
T3
2. The InPro 725X/*/*/* conductivity sensors may only
3. The capacitance and inductance of the connecting
4. The independent process terminal used for installa-
5. The independent process terminal used for installa-
6. The minimum conductivity of the media for safe
Screen
Cable
Analog GND / circuit zero
Schematic diagram InPro 725X Series
© 09/08 Mettler-Toledo AG
Printed in Switzerland
rature measuring circuit as part of an intrinsically
safe system are isolated from conductive housing
parts up to a maximum rated voltage of 30 V.
in accordance with the temperature classes shown in
the table below:
be used in suitable process terminals of METTLER
TOLEDO or other manufacturers in potentially explo-
sive atmospheres.
cable must be taken into account in the design.
tion of the conductivity sensors must be connected to
the equipotential bonding system of the installation.
tion of the conductivity sensors must be included
in the recurring pressure test of the installation if
necessary.
working in potentially explosive atmospheres must be
higher than 1 nS/cm.
Circuit board 11-01-61-01-02
JP6
1
Coil IN cable D1
ZMM6.8
D4
JP8
ZMM6.8
1
Coil OUT cable
Circuit board 11-01-61-01-02
JP1
1
T1 cable
JP3
1
T2 cable
JP5
1
T3 cable
JP6
1
D1
Coil IN cable
ZMM6.8
D4
JP8
ZMM6.8
1
Coil OUT cable
Maximum permissible
process temperature
68 °C
80 °C
108 °C
130 °C
JP7
1
D2 D3 Coil IN sensor
ZMM6.8 ZMM6.8
D5 D6
JP9
ZMM6.8 ZMM6.8
1
Coil OUT sensor
JP2
1
T1 sensor
JP4
1
T2 sensor
JP7
1
D2 D3
Coil IN sensor
ZMM6.8 ZMM6.8
D5 D6
JP9
ZMM6.8 ZMM6.8
1
Coil OUT sensor
Sensor head
CH - 8606 Greifensee
52 002 799
9
L1
u = 120
300mH (typ.)
R1
Pt1000
L2
u = 120
300 mH (typ.)