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1 INTRODUCTION
The Models 4681 and 4686 Oxygen Transmitters are
designed for continuous monitoring of Oxygen content in
applications using 'in situ' ZGP2 probes.
Operation and programming of each Transmitter 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, each 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.
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 Instructions, IM/ZGP2 .
Alarm
Retransmission
Output
Fig. 1.1 System Schematic
2
subject to limits
2,
20.0
% O x y g e n 7 0 0 ° C
A1
A2
Power
Supply
2 PREPARATION
2.1 Checking the Code Number
2.1.1 Wall-/Pipe-mounted Instruments – Fig. 2.1
Fig. 2.1 Checking the Code Number
(Model 4681)
2.1.2 Panel-mounted Instruments – Fig. 2.2
Slide instrument
out of case
3
1
Remove Plug
2
(if fitted)
Undo captive
screw
Fig. 2.2 Checking the Code Number
(Model 4686)
(Wall- /Pipe-mounted Model)
4681/501
4686/501
(Panel-Mounted Model)
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