11
7.2
Description of configuration menu
functions
This section contains a detailed description of each
function in the configuration menu. It should be read
in conjunction with Figs 6, 7 & 8.
7.2.1 Transmitter input ‘InPut’
This function enables the BA474ND indicating
temperature transmitter to be conditioned to operate
with a thermocouple, 3 or 4 wire resistance
thermometer, voltage or 3 or 4 wire resistance input.
A differential resistance thermometer input may also
be selected. A differential thermocouple input is
achieved by selecting the thermocouple input in this
function and turning the cold junction compensation
off in the CJC function – see 7.2.5.
Sensor Transmitter
display
Thermocouple ‘tHC’
3 wire RTD
‘3rtd’
4 wire RTD
‘4rtd’
Differential RTD
‘d_rtd’
Voltage ‘VoLt’
3 wire resistance
‘3rES’
4 wire resistance
’4rES’
The ‘InPut’ function is the first function displayed
when entering the configuration menu, or it may be
selected from within the menu by operating the
▼
or
▲
button. To enter the function press
P
which will
reveal the existing setting which may be changed
using the
▼
or
▲
button. When the required input
has been selected press
E
to enter the selection and
return to the ‘InPut’ prompt in the configuration menu.
7.2.2 Thermocouple type ‘t.tYPE’
This function enables one of eight common
thermocouples to be selected. The following table
shows the thermocouple types, indicator display and
the operating temperature range.
THC BA474ND Temperature
Type Display range
o
C
B
‘b’
200
to
1820
E
‘E’
-200
to
1000
J
‘J’
-210
to
1200
K
‘H’
-200
to
1372
N
‘n’
-200
to
1300
R
‘r’
-50
to
1768
S
‘S’
-50
to
1768
T
‘t’
-200
to
400
The ‘t.tYPE’ function may be selected from within the
menu by operating the
▼
or
▲
button. To enter the
function press
P
which will reveal the existing setting
which may be changed using the
▼
or
▲
button.
When the required thermocouple has been selected,
press
E
to enter the selection and return to the
‘t.tYPE’ prompt in the configuration menu.
7.2.3 Units of digital display ’dEG’
The transmitter digital display may be in one of four
units of temperature.
Units Transmitter Display
o
C
o
C
o
F
o
F
r
r
K
H
When
o
C or
o
F are selected the units of measurement
are shown at the top left hand corner of the display
when the transmitter is in the operating mode.
The ‘dEG’ function may be selected from within the
menu by operating the
▼
or
▲
button. To enter the
function press
P
which will reveal the existing setting
which may be changed using the
▼
or
▲
button.
When the required units have been selected, press
E
to enter the selection and return to the ‘dEG’ prompt
in the configuration menu.
7.2.4 Display resolution ‘rESn’
This function defines the resolution of the transmitter
display but does not affect the resolution of the
4/20mA output current.
Resolution Transmitter Display
Lo
0 0 0 0 0
Hi
0 0 0 0
.
0
The ‘rESn’ function may be selected from within the
menu by operating the
▼
or
▲
button. To enter the
function press
P
which will reveal the existing setting
which may be changed using the
▼
or
▲
button.
When the required resolution has been selected,
press
E
to enter the selection and return to the ‘rESn’
prompt in the configuration menu.
7.2.5 Cold junction compensation ‘CJC’
The temperature of the thermocouple cold junction,
which is the transmitter input terminals, is measured
and added to the thermocouple output so that the
transmitter displays and transmits the hot junction
temperature. If cold junction compensation is not
required e.g. for differential measurements with two
thermocouples, this function allows it to be turned off.
The ‘CJC’ function may be selected from within the
configuration menu by operating the
▼
or
▲
button.
To enter the function press
P
which will reveal the
existing setting which may be changed using the
▼
or
▲
button. When set as required, press
E
to enter
the selection and return to the ‘CJC’ prompt in the
configuration menu.