Eurotherm 5100e, Руководство пользователя

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100 MM GRAPHICS RECORDER: USER GUIDE
HA027271
Issue 12 Mar 04
User Guide
Page 52
Break Response
Cold Junction Type
Remote CJ Temp from
Descriptor
None
Remote
Channel 3 ˚C
F u r n a c e 1 T e m p
4.3.3 CHANNEL/ALARM CONFIGURATION (Cont.)
BREAK RESPONSE
For thermocouples and other low level inputs (i.e. input voltages less than 150mV), the recorder can be made to re-
spond in one of the following ways, if a break in the input circuit is detected.
None
trace drifts with the input wiring acting as an aerial.
Drive hi trace placed at full scale
Drive lo trace placed at scale 'zero'
COLD JUNCTION COMPENSATION (CJC)
For input type = thermocouple, None, Internal, External or Remote can be selected for cold junction compensation.
INTERNAL
Internal CJC is by means of an RTD connected across pins 11 and 12 of the input board connector.
EXTERNAL
If the cold junction is maintained (by the user) at a known, fixed tempera-
ture, 'external' should be selected. An extra numeric entry box appears to
allow the user to enter the temperature at which the cold junction is main-
tained.
REMOTE
'Remote' is selected if the cold junction temperature is to be
measured by an external device connected to the instrument.
An extra picklist appears which allows the user to select any
input or maths channel to act as the cold junction temperature
source channel. The temperature units displayed here, are those of
the channel being configured, not those of the CJ source channel. The CJ source channel must be configured appropri-
ately for the external device, and must provide a value which is consistent with the configured channel's units.
DESCRIPTOR
Allows a text string of up to 20 characters (including spaces) to be entered for the channel descriptor. (E.G. 'Turbine 2
tempA').
A/B SWITCHING
If enabled, this function allows alternative Span, Zone and Trace Colour values to be entered. 'A' values are used
during normal operation. 'B' values are switched to by job action, as described in
section 4.7
SPANNED
This box, when selected, allows span low and high values to be entered. For example, in an input range of 0 to 600
deg C, it may be that the temperature range between 500 and 600 degrees is of most interest. In such a case, setting
span low to 500 and span high to 600 will cause the recorder to display only that part of the input range, and this will
fill the zone width which is selected next, effectively magnifying the area of interest.
If A/B switching is enabled, a second set of span low and span high values can be entered. 'A' values are used during
normal operation. 'B' values are switched to by job action, as described in
section 4.7 .
Break Response
Cold Junction Type
External CJ Temp
Descriptor
None
External
0
F u r n a c e 1 T e m p