Table 2.1 Process Indicator Front Panel Controls And Indicators - Michell Instruments Pura User Manual

Item
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Table 2.1
Michell Instruments
Pura Online Hygrometer User's Manual
ºFdp
When illuminated, this LED indicates that the displayed dew-point reading is
in degrees Fahrenheit.
Note: If neither the ºFdp or ºCdp LED is lit, ppm
ºCdp
When illuminated, this LED indicates that the displayed dew-point reading is
in degrees Celsius.
Note: if neither the ºCdp nor ºFdp LED is lit, ppm
Main dew-point temperature display
Flashes to alternately indicate '
for low temperatures under-range (lower than -120ºCdp (-184ºFdp) or
-129.9ºCdp (199.9ºFdp) for an open loop condition).
Flashes to alternately indicate
for high temperature over-range.
AL1
When illuminated, this LED indicates that the dew-point temperature
programmed for Alarm 1 has exceeded the programmed threshold. Under
these conditions the alarm relay contacts associated with this alarm (normally
open) will change state (close) and will remain closed until the dew-point
temperature moves back within the programmed operational limit.
Alarm 1 is usually allocated to the Low Alarm setting.
These relay contacts are rated at 250 V, 3 A and are connected as shown in
Section 3.4.
Section 3.6.2 describes the setting up of AL1 trip points.
AL2
When illuminated this LED indicates that the dew-point temperature
programmed for Alarm 2 has exceeded the programmed threshold. Under
these conditions the alarm relay changeover contacts associated with this
alarm will change state and will remain in this state until the temperature
moves back to within the programmed operational limit.
Alarm 2 is usually allocated to the High Alarm setting.
These changeover relay contacts are rated at 250 V, 5 A and are connected
as shown in Section 3.4.
Section 3.6.2 describes the setting up of AL2 trip points.
Process Indicator front panel controls and indicators
3
Description
V
' (error low) and temperature reading
ErrL
'ErrH
' (error high) and temperature reading
97303 Issue 1.2, March 2016
is selected.
is selected.
V