Baker Hughes Panametrics XDP, Руководство пользователя

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1
Chapter 1. General information
1.1 Introduction
The XDP explosion-proof display is a general-purpose
display/control unit used for oxygen and thermal
conductivity measurement applications in zone 1
environments. A second part of the system is a
remotely-mounted sensor/transmitter, such as the
Panametrics oxy.IQ, XMO2 or XMTC .
NOTE: Refer to the documentation supplied with the specific
transmitter for complete information on the transmitter.
The XDP performs the following basic functions:
• Supplies 24 VDC to power the transmitter
• Accepts and processes a 4-20 mA output from
the transmitter
• Shows a selected process parameter on a
digital display
• Provides a user interface for programming
the system
• Provides user-configurable alarm relays and an
analog output
The XDP is wall-mounted via its integral mounting plate and
it is connected to the transmitter with an electrical conduit.
It is certified for use in zone 1 hazardous areas.
1.2 Basic features
The XDP incorporates the following basic features:
• Wall-mountable, explosion-proof enclosure
• Universal 100-240 VAC power input
• 24 VDC power output
• 4-20 mA analog input
• 4-20 mA/0-20 mA/0-2 V analog output
• RS-232/RS-485 serial port
• High-resolution, backlit LCD digital display
• Six-key, magnetic (“through-the-glass”) keypad
• Five general-purpose alarm relays
• Automatic calibration
See "Figure 1" on page 1 for a picture of the XDP.
1.3 System overview
Figure 1: The XDP
In a binary gas mixture, the transmitter measures the
concentration of a target gas in a known background
gas (see the transmitter documentation for a discussion
of the specific technology employed by the sensor
mechanism). To be suitable for use in an XDP system,
the transmitter must:
• Be self-powered or powered by the +24 VDC output
from the XDP
• Output a 4-20 mA signal to the XDP analog input
• Comply with all performance specifications for
the system
• Mains supply voltage should not exceed 10% of nominal
supply voltage
• Installation category II
• Pollution degree 2
• Maximum altitude: 2000 m
• Humidity: up to 80% humidity for temperatures up
to 31 °C (88 °F) decreasing linearly to 50% humidity
at 40 °C (104 °F)
• Temperature range: -10 °C to +65 °C (+14 °F to +149 °F).
The XDP accepts a 4-20 mA analog output from the
transmitter and processes the information. Then, the
results are displayed on the built-in digital display window.
In addition, the data may be output as a linear analog
signal to drive a data recorder or similar device.