Texmate, Inc. Tel. (760) 598-9899 • www.texmate.com
Page 7
BX-B31 Data Sheet (BX3)
Case Dimensions
Input Module Calibration Procedures Continued
The second step is to set the ZERO ADJUST and or ZERO OFFSET
RANGE Header to provide a positive or negative offset so that calibra-
tion with the ZERO pot will offset the Display Span to produce the
required display reading.
Example B: Using a BX-B31 Bargraph meter.
Input signal 1 to 5 V to read zero to full scale.
Signal Span = 4 V, Display Span = 30 segments
1 If the module has an INPUT RANGE Header the 2 V position should
be selected. This will provide a display of 30 segments for an input of
2 V which is (2 ÷ 4) = 50% of the examples 4 V signal span. To scale
down the Signal Span to 50% select the next higher 60% Signal
Span position on the SPAN ADJUST Header (position 3).
2 If the module is a Process Input 1-5 V DC type, select the (Hi Range)
position on the SPAN RANGE Header and the 100% Signal Span
position on the SPAN ADJUST Header (position 5, max increase).
This will provide a display of 30 segments for an input of 4 V which is
100% of the examples 4 V Signal Span.
3 Set the ZERO OFFSET RANGE Header to the center position (no
offset). Apply 1 V and adjust the SPAN pot until the display reads 8.5
segments . A 4 V input would then read 30 segments.
4 Set the ZERO OFFSET RANGE Header to the negative offset posi-
tion. If the module has a ZERO ADJUST Header select the position
that will provide a negative offset of
≈
25 segments. Apply 1 V and
adjust the ZERO pot until the display reads zero. Apply 5 V and check
that the display reads full scale.
Example C: Using a BX-B31 Bargraph meter
Input signal 4 to 20 mA to read zero to full scale
Signal Span = 16 mA, Display Span = 30 segments
1 The full scale Signal Span of the Process Input 4-20 mA modules is
0 to 20 mA for a full scale Display Span of 0 to 30 segments.
2 Select the (Lo Range) Position on the Span Range Header and the
70% Signal Span position on the SPAN ADJUST Header (position 2).
3 Set the ZERO OFFSET RANGE Header to the center position (no
offset). Apply 4 mA and adjust the SPAN pot until the display reads
8.5 segments. A 16 mA input would then read 30 segments.
4 Set the ZERO OFFSET RANGE Header to the positive offset posi-
tion. If the module has a ZERO ADJUST Header select the position
that will provide a negative offset of
≈
–8.5 segments. Apply 4 mA
and adjust the ZERO pot until the display reads zero. Apply 20 mA
and check that the display reads full scale.
Texmate’s unique SPAN ADJUST and SPAN RANGE Headers provide
the circuit equivalent of an ultra-precision one megohm 75 or 150 turn
potentiometer that can infinitely scale down any Input Signal SPAN to
provide any Display Span from full scale to the smallest viewable unit.
If the module has an INPUT RANGE Header, and the required full
scale Display Span (digital counts or bargraph segments) is to be
larger than the directly measured value of the input Signal Span,
then the next lower range on the INPUT RANGE Header should be
selected. The resulting over range Signal Span is then scaled
down, by selecting the position of the SPAN RANGE Header and
or the SPAN ADJUST Header, which will reduce the input Signal
Span to a percentage, that the required Display Span can be
reached by calibration with the SPAN pot.
Example A: Using a BX-B31 bargraph meter
Input signal 0 to 10 V to read zero to full scale.
Signal Span = 10 V, Display Span = 30 segments
1 Select the 2 V INPUT RANGE Header position. The standard direct
scaling will provide a display of 30 segments with an input of only 2
V which is (2÷10) =20% of the examples 10 V Signal Span.
2 To scale down the Signal Span to 20% select the 20% Signal Span
position on the SPAN ADJUST Header (position 1) or if the module
has a SPAN RANGE Header, select (LO Range) and 20% Signal
Span position on the SPAN ADJUST Header (position 2).
3 Apply a zero input or short the input pins. The display will auto zero,
or if the module has a ZERO pot, it should be adjusted until the dis-
play reads zero.
4 Apply 10 V and adjust the SPAN pot until the display reads full scale.
Large offset scaling and calibration of process signal
inputs with modules that utilize ZERO ADJUST
Headers and or ZERO OFFSET RANGE Headers.
Texmate’s unique ZERO OFFSET RANGE Header enables the use of
a simple two step scaling and calibration procedure for those process
signals that require large offsets. This eliminates the back and forth
interaction, between zero and span settings, that is often required to
calibrate less finely engineered products.
The first step is to set the ZERO OFFSET RANGE Header to the cen-
ter position (No Offset) and scale down the Input Signal Span to a per-
centage that will enable calibration with the SPAN pot to reach the
required Display Span.
PANEL CUTOUT
22.2mm
(0.88")
Sn
ug Fitting
92mm
(3.62")
Loose
Fitting
21.85mm
(0.86")
91mm
(3.59")
Case will mount in
standard 1/16 DIN cutouts
The 96x24mm case is particularly
suitable for mounting in mosaic
panels or insulative panels up to 2"
thick. They can also stack mount, 2
up in existing cut-outs for 1/8 DIN
(96x48mm) or 4 up in 1/4 DIN
(96x96mm).
TOP VIEW
122.2mm
(4.83")
5mm
(0.2")
12.7mm
(0.5")
21.85 mm
(0.86")
Right-angled
Connector
96mm
(3.78")
1/16 DIN
96x24mm
24mm
(0.95")
FRONT VIEW
3mm
(0.12")
typical
Release Bottom Catch with a
small flat blade, and lever outwards.
Top Catch
Bottom Catch
TO REMOVE REAR COVER
Panel adaptor plates are
available to retrofit most
existing panel cutouts.
P
100
80
60
40
20
0
P
100
80
60
40
20
0
P
100
80
60
40
20
0
When extra panel
mounting tightness is
required, optional Screw
Mounting Clips are
included, which fit on the
Mounting Slide Clips.
Various bezel colors
are available.
Black is standard.
P
100
80
60
40
20
0
P
100
80
60
40
20
0
97.8mm
(3.86")
91mm
(3.59")
Max. panel thickness
75mm (2.95")
3.5mm (0.14")
Connector
Sockets
SIDE VIEW
92.8 mm (3.6") Widest
mountable panel cutout
without using adaptors.
For additional strength, extra Mounting
Slide Clips can be ordered and doubled
up one behind the other. (P/N: 75-DMT96X24)
Clear Lockable NEMA 4X
Splash Proof Lens Cover
can accept two 1/16 DIN
cases. P/N.(OP-N4/96X48)
P
100
80
60
40
20
0
P
100
80
60
40
20
0
Cam opening
Safety catch
Removable
Key-lock
SP
2
3
1
SP
2
3
1
SP
2
3
1
SP
2
3
1
SP
2
3
1
SP
2
3
1
SP
2
3
1
