Introduction - ABB ZDT Installation And Operating Manual

1 INTRODUCTION

The ZDT Oxygen Analyzer is designed for continuous
monitoring of oxygen content in applications using 'in situ'
ZGP2 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, or cell temperature. 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
2
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
detailed in Section 7.7.
Alarm
Retransmission
Output
2
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 external reference air unit is used to provide
reference air supply for the ZGP2 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 ZGP2 probe
refer to the operating manual, IM/ZGP2 .
subject to limits
2,
ZDT Oxygen Analyzer
20. 0
% Oxygen
Power
Supply
Fig. 1.1 Schematic Diagram