Introduction - ABB ZDT–FG Series Installation And Operating Manual

1 INTRODUCTION

The ZDT Oxygen Analyzer is designed for continuous
monitoring of oxygen content in applications using 'in situ'
ZFG2 probes.
Operation and programming of the ZDT Analyzer is via four
tactile membrane switches and a digital display located on the
front of the instrument. Two l.e.d.'s on the front panel provide
local alarm indication.
In operation, the instrument can display measured % oxygen,
cell mV, cell temperature or probe heater output. Set up of
alarm, retransmission and calibation parameters is achieved
in programming mode, where key parameters are protected by
a five-digit security code.
Measured %O values can be retransmitted to remote
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equipment using the retransmission output facility. The range
of values retransmitted can be set anywhere within the
instrument's display range of 0 to 25% O
in Section 7.6.
Relay Output
Alarm
Retransmission Output
Relay Output
Alarm
Retransmission Output
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Remote alarm indication is provided by two relay outputs.
Relays are programmed to activate when the oxygen level
moves either above or below a pre-defined set point. The
second alarm relay can also be used as a 'general alarm'
which activates in the event of an instrument or system fault.
An optional internal reference air unit is used to provide
reference air supply for the ZFG2 probe. If this unit is not
specified, reference air must be supplied to the probe from an
alternative source.
For full installation and operation details of the ZFG2 probe
refer to the probe operating instructions, IM/ZFG2 .
, subject to the limits
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ZDT Oxygen Analyzer
Power
A - Internal Reference Air Connection
Supply
ZDT Oxygen Analyzer
Power
B - External Reference Air Connection
Supply
Fig. 1.1 Schematic Diagram
Z-FG2 Probe
Reference air supplied to probe
via feed pipe running inside the
probe conduit assembly.
Z-FG2 Probe
External reference air feed