ABB 2000 Series Руководство пользователя - Страница 2
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1 INTRODUCTION
Information.
•
Pressure range must be compatible with the maximum pressure being
measured.
•
Pressure media must be compatible with the transmitter wetted parts
listed in these instructions.
•
Liquid must not be allowed to freeze in the pressure port.
•
Exposed ends of cables must be free from moisture.
•
The gasket must be fitted under the electrical connector.
•
Wetted parts:
17 – 4 PH stainless steel plus Nickle Braze to BS1845 : NK3/HTN2.
The Series 2000 Pressure Sensors are ideal for applications where a
conventional transmitter is too expensive and over specified. The Series 2000 is
a low-cost simple transducer which can be used in a large number of applications
ranging from heating and ventilation to industrial hydraulics
Series 2000 sensors can be used as a primary sensor, utilizing one of ABB's
control products, e.g. COMMANDER 300/310 etc.
2 MECHANICAL INSTALLATION
2.1 Pressure Connections
•
Gl/4 external to BS 2779 compatible with ISO 228 (recommended seal
Part Number 232646-0002 or Dowty Part Number 400-021-4490-41).
2.2 Environmental Limits
•
Temperature limits: –20°C to 80°C.
2.3 Dimensions – Fig. 2.1
Dimensions in mm (in.)
12.4
54.6
(0.49)
(2.15)
19.05 (0.75) A/F Hex.
Fig. 2.1 Sensor Dimensions
3
6
25 (0.98)
(0.12)
(0.24)
3 ELECTRICAL INSTALLATION
3.1 Electrical Connections
See Table 3.1 for electrical connections.
Electrical Connections
Electrical Specifications
Table 3.1 Electrical Connections and Specifications
3.2 Grounding
All versions should be grounded by the installation pipework. If this is not possible,
the sensor should be grounded at the instrumentation end via the appropriate pin
or green lead. For maximum protection against RFI all versions should be installed
using screened cable with the screen grounded at the instrumentation end.
3.3 Resistive Loading
The total permissible resistive load in the loop (to include all the cable resistance)
can be from 'zero to 50 x (supply volts –12) ohms, eg. with a 24V d.c. supply the
permissible load is from zero up to 600 ohms, see Fig. 6.1.
+
Power
Supply
–
12 to 36V d.c.
Resistive Load
Fig. 6.1 Resistive Load
3.4 Applying Power
Before applying power, ensure the correct polarity and excitation levels are
applied.
3.5 Calibration
Transmitters are calibrated to a fixed range at time of order,identified by the fifth
and sixth letter of the identification code marked on the sensor housing
– see Specification Sheet SS/2000.
4 MAINTENANCE
4.1 Routine Inspection
Limited to periodic inspection of the cable and connector to ensure that these are
neither damaged nor softened by incompatible liquid.
4.2 Repair
The instruments cannot be repaired locally. If damaged, return to the Company at
the
address
shown
overleaf
replacement/repair is required.
+ve
–ve
case earth
Pin 1
Pin 2
Pin 4
Rated
Min/Max.
Milliamps
24V d.c.
12 to 36
4 to 20
+
Transmitter
–
or
to
accredited
dealers
when
a