Other functions
Display Summary of Programme Menu
functions
'CAL'
Calibration of 4/20mA output
This sub-menu defines the relationship
between the transmitter 4/20mA output
and the transmitter display. 'ZEro'
defines the display at which the output
is 4mA, and 'SPAn' the display at which
the output is 20mA. See section 6.6
'Cond'
Conditioning of internal references
WARNING!
This sub-menu is password
protected. It is not necessary
to carry out this operation
before putting the instrument
into service.
This sub-menu enables the internal
references to be calibrated against
external voltage, resistance and current
standards. It is normally only
necessary to use this function once per
year.
If the Trim Menu is used to calibrate the
transmitter, the internal references do
not require re-calibration.
See section 6.8
'COdE' Security code
Defines a four digit numeric code which
must be entered to gain access to the
Programme and the Trim Menus.
Default code 0000 disables the security
function and allows unrestricted access
to all functions in the programme and
trim menus.
See section 6.7
6.2 Description of Programme Menu functions
This section contains a detailed description of each
function in the Programme Menu. It should be read
in conjunction with the summaries in section 6.1
and the programme structure shown in Figs 5A and
5B.
6.2.1 Transmitter input 'InPut'
This function conditions the transmitter to accept a
thermocouple 'tHC', resistance thermometer 'rtd'
or a voltage 'UOLt' input. To define the
transmitter input select 'InPut' from the Programme
Menu and press
P
which will reveal the current
setting. This setting may be changed by scrolling
through the menu using the
Up
or
Down
buttons.
When the required input is displayed, pressing
P
will reveal a sub-menu from which, for
thermocouple and resistance thermometer inputs,
the type of sensor may be selected and associated
parameters programmed.
6.3 For thermocouple inputs
6.3.1 Type of thermocouple 'tYPE'
After selecting a thermocouple input, pressing
P
will reveal the 'tYPE' sub-menu which contains
seven different thermocouples:
Type Display Standard
E
E
BS4937 Part 6 : 1974
J
J
BS4437 Part 3 : 1973
K
h
BS4437 Part 4 : 1973
N
n
BS4437 Part 8 : 1986
R
r
BS4937 Part 2 : 1973
T
t
BS4937 Part 5 : 1973
Pallaplat
PALL
Pfaulder BA302e
Pressing
P
again will display the current type of
thermocouple which may be changed by scroll
through the menu using the
Up
or
Down
buttons.
When the required type is displayed, press
E
to
return to the sub-menu.
6.3.2 Display units 'dEg'
The transmitter display may be in degrees
centigrade or Fahrenheit. To check or change the
display units select 'dEg' from the sub-menu and
press
P
to reveal the current setting. The setting
may be changed by pressing the
Up
or
Down
button. When the required units are displayed,
press
E
to return to the sub-menu.
6.3.3 Display resolution 'rESn'
The output of each type of thermocouple can be
displayed with high or low resolution as shown
below. Low resolution can improve the readability
of a noisy or rapidly changing display, but does not
degrade the performance of the 4/20mA analogue
output. High resolution is only available when the
transmitter is displaying temperature in
o
C. When
o
F is selected the resolution is always one degree.
To check or change the display resolution select
'rESn' from the sub-menu and press
P
to reveal
the current setting. The setting may be changed
by pressing the
Up
or
Down
button. When the
required resolution has been selected, press
E
to
return to the sub-menu.
Display Resolution
Type Low (Lo) High (Hi)
E
1
o
C
0.1
o
C
J
1
o
C
0.1
o
C
K
1
o
C
0.2
o
C *
N
1
o
C
0.2
o
C *
R
1
o
C
0.4
o
C *
T
1
o
C
0.1
o
C
Pallaplat
1
o
C
0.2
o
C *
13
Summary of Contents for BA374NC
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