13 Cleaning Menu
37
13 Cleaning
Menu
Cleaning
Duration
Interval
On/Off-line
Recovery time (Off-line) or Delay Y/N (On-line)
A set point relay can be configured to operate a jet spray wash or rotary electrode
cleaning system on a timed cycle. The purpose is to prevent accumulation of
particulate matter on the active surfaces of the sensor. The Set Point relay would
control the supply to the cleaning device.
The
Cleaning
item on the Set Point menu (see
Section 8 Set Point Relays
) has the
following parameters:
Duration –
The duration of the cleaning operation (5s to 10 min.)
Interval –
The interval between cleaning operations (5 min to 48 hours).
On/Off line – The required system state during a cleaning operation. When Off line,
the other current output and relays are disabled.
Recovery – This option only appears if Off-line has been selected. This is the time
allowed for the sensor to recover from cleaning. It is the time from the
end of cleaning to the return to the On-line state (5s to 10 min).
Delay Y/N – This option only appears if On-line has been selected. If unit is to
remain On line during cleaning, a
Y
option forces the cleaning to wait
until all relays are inactive. While cleaning is being delayed, an E23
error message may be displayed.
The instrument can be taken off-line during a ‘Clean’ cycle. This will de-energise the
set point relay and freeze the current output which could otherwise cause chaos in
the control system as a result of cleaning solution being sprayed onto the sensor.
By selecting the automatic Off-Line facility in the menu, spurious relay / current
output changes are prevented during the
Duration
and
Recover
periods. Normal
operation is restored during the
Interval
period. The clean
Delay
function gives
priority to the control relays. This means that a ‘Clean’ cycle will be delayed for as
long as necessary until the control relays are in the Off state.
A manual clean cycle can be initiated by a remote switch/contacts connected to the
instrument digital input terminals (see
Section 3.4 Connections
). The ‘Clean’ cycle
software, if selected, runs automatically and continuously from power up, beginning
with the
Interval
period. It can only be stopped by changing the operating mode of
the Set Point relay or Current output which it is controlling.
Содержание HPT63
Страница 1: ...HPT63 pH REDOX TRANSMITTER OPERATION GUIDE...
Страница 2: ......
Страница 8: ...Contents iv...
Страница 14: ...3 Installation 6 63mm 59 mm 138mm 116mm 273 mm 70mm 116mm Figure 2 Head mounting component dimensions...
Страница 52: ...15 Guarantee and Service 44...
Страница 58: ...18 Appendix C Redox Solutions 50...
