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5 ELECTRONICS SECTION
5.1 Front Panel Controls - Figs. 5.1 and 5.2
The program controls comprises five tactile membrane
switches. In normal operation the switches are used to view
the measured variable, the concentration alarm values,
diagnostics
and
status
programming and calibration pages are protected by customer
programmable security codes.
When programming, the switches are used to sequence
through a programming procedure as detailed in Section 6.
The procedure is set out in programming pages for Input,
Current Output, Alarms, Real Time Clock and Monitor
Calibration. Each program page contains the program
functions, the values or parameters of which are all
programmable.
Switch functions are described in Fig. 5.1.
Three other switches are situated on the side of the electronic
section – see Fig. 1.1. Their functions are as follows:
Mains ON/OFF
Used to isolate the mains (power) supply
from the instrument.
Warning. Externally powered alarm circuits may
still contain high voltages. These circuits must be
switched off independently.
Pump ON/OFF
Used to switch the pumps on and off
during maintenance.
HOLD-ON/OFF
Used during maintenance to hold the
concentration alarms, activate the 'Out
of Service' relay, and inhibit any timed
automatic calibrations.
5.2 Display
The monitor display panel indicates the solution concentration
and provides user information during setting up and in normal
operation.
14
information.
Access
to
5.3 L.E.D. Indicators
Out of
Service
Indicates that the monitor out of service alarm is
active, the source is indicated on Programming
the
Page 1.0 – see Section 6.
Cal
Indicates when a calibration sequence is taking
place.
Hold
Indicates that the HOLD switch has been
switched to 'HOLD' during servicing. This holds
the current concentration alarm states and
activates the 'Out of Service' alarm relay, and
inhibits timed automatic calibrations.
• Single Stream
Alarm 1,2
Used to indicate a concentration alarm state
(either high or low).
Out of
Sample
Indicates that sample has been lost.
• Multi-Stream
Stream 1
to 6
These are two color red/green l.e.d. indicators.
A continuous green indication shows the
stream(s) selected, a flashing green indication
shows the stream which is currently being
sampled, and a red indication signifies an 'Out
of Sample' alarm on the stream indicated.
Alarms 1
to 6
Used to indicate either a concentration alarm
state (either high or low).
These indicators are used in association with external alarm
relay outputs except for the multi-stream version where the
Relays 1 to 6 can be configured as remote stream 'Out of
Sample' or concentration alarm indication – see Figs. 2.4
and 2.5.
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