weschler instruments BG Series User manual

WESCHLER INSTRUMENTS
DIVISION OF HUGHES CORPORATION
OWNERS
MANUAL
for
BG Series
REVISION 2.8 10/17
16900 Foltz Industrial Parkway, Cleveland, Ohio 44149
Phone: [phone] Fax: [phone]
Email: [email protected]

Contents
1 INTRODUCTION ............................................................................................................................. 1
2FEATUREDESCRIPTIONS .............................................................................................................. 2
BarGraphProtection......................................................................................................................... 2
BarDisplay ...................................................................................................................................... 2
DigitalDisplay .................................................................................................................................. 2
Trend Indicators(Option) ................................................................................................................. 3
Setpoints(Option) ............................................................................................................................ 3
TemperatureMeasurement................................................................................................................ 4
Hysteresis......................................................................................................................................... 4
Retransmit(Option) .......................................................................................................................... 4
Peak/Valley(Option) ........................................................................................................................ 4
Power .............................................................................................................................................. 4
3INSTALLATION................................................................................................................................5
Verification ....................................................................................................................................... 5
Mounting .......................................................................................................................................... 5
ElectricalHookup ............................................................................................................................. 6
4SETUP ............................................................................................................................................... 7
NormalDisplayOperation ................................................................................................................ 7
DisplayOperationDuringSetup ........................................................................................................ 7
OperatorandSupervisorSetup......................................................................................................... 8
4.1OPERATORSETUPPROGRAMMING......................................................................................... 9
ActivatingOperator Setup ................................................................................................................ 9
OperatorSetupActions .................................................................................................................... 9
AlarmSetpoints .............................................................................................................................. 10
4.1.1FAILSAFESETPOINT SETUP PROCEDURE ......................................................................... 11
HighSetpoint.................................................................................................................................. 11
LowSetpoint.................................................................................................................................. 11
4.2SUPERVISORSETUPPROGRAMMING ................................................................................... 12
ActivatingSupervisorSetup ............................................................................................................ 12
SupervisorSetupFunctions............................................................................................................. 12
AlarmSetpoints .............................................................................................................................. 14
Enable/DisablePeak/Valley ............................................................................................................. 15
SetHysteresis................................................................................................................................. 15
BarGraph™Zero ........................................................................................................................... 16
BarGraph™FullScale ................................................................................................................... 16
SetBarform.................................................................................................................................... 17
Enable/DisableOperatorSetup ....................................................................................................... 18
SetDecimalPoint ........................................................................................................................... 18
Set Bar Zero .................................................................................................................................. 19
SetBarFullScale ........................................................................................................................... 20
Set ID ............................................................................................................................................ 20

5 CALIBRATION ......................................................................................................................... 21
Calibration Procedure ............................................................................................................. 21
6 TEMPERATURE MEASUREMENT ....................................................................................... 24
7 ANALOG RETRANSMIT OPTION ........................................................................................ 25
Analog Retransmit Output Options ...................................................................................... 25
7.1 ANALOG RETRANSMIT CALIBRATION ........................................................................ 26
7.2 ISOLATED ANALOG RETRANSMIT CALIBRATION ................................................... 27
8 PEAK/VALLEY OPTION......................................................................................................... 29
Valley Display ........................................................................................................................ 29
Valley Capture Cycle ............................................................................................................. 29
Valley Reset ............................................................................................................................ 29
Peak Display ........................................................................................................................... 29
Peak Capture Cycle ................................................................................................................ 29
Peak Reset ............................................................................................................................... 29
9 REPLACEMENT PARTS.......................................................................................................... 30
10 WARRANTY ........................................................................................................................... 31
Appendix I - BARGRAPH RETROFIT GUIDE ........................................................................ 32
Appendix II - TERMINAL CONNECTIONS ............................................................................ 33
BG-252, BH-252, BD-101, PC-101, PH-101, PG-101 & PG-202 ........................................ 33
BG-241, 251, 261 & 281 ......................................................................................................... 34
Terminal Barrier Strip Option (BG-241, 251, 261 & 281) .................................................... 35
Line Frequency and Synchroscope (BG-241, 251, 261 & 281) ........................................... 36
Wattmeter Wiring (BG-241, 251, 261 & 281) ....................................................................... 37
Varmeter Wiring (BG-241, 251, 261 & 281) ......................................................................... 38
Power Factor Meter Wiring (BG-241, 251, 261 & 281) ........................................................ 39
RS-485 Communications Cabling ......................................................................................... 40
Appendix III - SPECIFICATIONS .............................................................................................. 41
Appendix IV - CIRCUIT BOARD LAYOUT DRAWINGS ..................................................... 42
BG-252, BH-252, BD-101, PC-101, PH-101, PG-101 & PG-202 ........................................ 43
BG-241, 251, 261 & 281 ......................................................................................................... 44
Option 4 Module (Isolated Analog Retransmit) ................................................................... 45
Appendix V - PHYSICAL DIMENSIONS.................................................................................. 46
BG-241, 251, 261 & 281 ......................................................................................................... 46
BG252 ..................................................................................................................................... 47
PC-101 and PC-202................................................................................................................. 47

1
1 INTRODUCTION
Weschler Instruments offers a complete line of BarGraph™ instruments that fit many existing analog
meter cutouts (see Appendix I) and can operate with the same input signals. They provide enhanced
features,such as peak/valley hold, retransmit,computer communication, plus multiple barand digital
displaycolorsandcombinationstomeetcustomer-specificengineeringconsiderations. Detailed speci-
fications are listed in Appendix III.
This manual covers the following standard BarGraph models from Weschler Instruments:
BG-251 6" Round BarGraph
BG-281 8" Round BarGraph (pictured)
BG-241 41/2" Square BarGraph
BG-261 81/2" Square BarGraph (pictured)
BH-252 6" Horizontal BarGraph (pictured)
PH-101 DIN (72 X 144 mm) Horizontal BarGraph
PC-202 DIN (72 X 144 mm) Dual Vertical BarGraph (pictured)
ML-202 DIN (72 X 144 mm) Dual Vertical BarGraph
PG-202 10" Dual Vertical BarGraph
BG-252 6" Vertical BarGraph (pictured)
BW-1316 6" Vertical BarGraph
PG-101 10" Vertical BarGraph
PC-101 DIN (72 X 144 mm) Vertical BarGraph

2
2 FEATURE DESCRIPTIONS
Weschler BarGraphs are internally protected against power and input surges. The power supply
integrates a fuse and MOV to insure that no circuit damage occurs. Input surges are virtually elimi-
nated by internal CTs and PTs (for AC) and a clamping circuit (for DC). For maximum limits, see
Appendix III, Specifications.
When measurements such as Retransmit and Communication are read from the BarGraph, the out-
puts are directly driven. The user should provide safeguards to prevent ground loops when using
these options.
Warning: Review Section 3, Installation, to insure that the proper inputs
and options were ordered and received. Connecting a BarGraph in the
wrong application may cause damage to the instrument!
Bar Display
The bar display consists of either 51 segments (PG-101 and PG-202) or 101 segments (all others).
The segments are either red (standard) or green (optional). Multi-color and amber bar displays are
alsoavailable.
The zero point can be set so that the bar scale begins indicating anywhere from the bottom to the top
of the instrument. The zero can also be set to a location that is not visible on the bar, to allow an
expanded indication. For process applications where the zero point could vary, simple programming
can give the user selections of 25%, 33%, 50%, or 100% from the bottom of the bar scale. Typical
applications that require an elevated zero point are: center frequency deviation (center zero - 50%),
vacuum measurements (25% and 33%), and mineshaft and elevator location (top zero - 100%).
Digital Display
The BarGraph can be combined with a seven segment, 3-1/2 digit (-1,999 to 1,999) or 4-1/2 digit
(-19,999 to 19,999) LED digital display to increase usefulness and instrument resolution. The digital
display is a dynamic option of the BarGraph since all readings can be in direct or engineering units
related to any input signal. The analog trend on the bar graph can be seen at a glance, but when
critical measurements or fine tuning are required, the digital display has a resolution of up to 0.01%.
The standard color for the digital display is red, with green or amber available as options.
BarGraph Protection

3
Trend Indicators (Option)
The BarGraph provides visual indication of the process signal direction. The annunciator arrows on
the front of the BarGraph are red or green LEDs that respond to changes in input signal at a rate
corresponding to the programmed hysteresis.
Setpoints (Option)
The setpoint option converts a BarGraph from an indicator to a differential gap or on/off-style con-
troller. The BarGraph accommodates up to four setpoint locations: Hi/Hi, Hi (alarms when the signal
is higher than one of two Hi setpoint values), Lo, and Lo/Lo (alarms when the signal is below one of
two low setpoint values).
When any of the alarm values are met, alarm annunciators on the front of the BarGraph light and
form “C” relays close. The relay contacts can be used to sound alarms or control the process.
To identify each setpoint location in relationship to the displayed input signal, each LED segment
representing the setpoint value will be illuminated when the signal is less than the setpoint value or
non-illuminated when the signal is greater than the setpoint value. When the input signal is at a value
corresponding to one LED segment above or below the LED segment representing the setpoint
value, the setpoint LED segment will flash at a 1 Hertz rate. When the input signal value corresponds
to the setpoint LED segment exactly, the LED segment will flash at a 2 Hertz rate.

4
Temperature Measurement
Weschler BarGraphs may be used to measure temperature using either thermocouples or RTDs
(Resistive Thermal Devices). Thermocouples consist of two dissimilar metals joined so that a poten-
tial difference is generated that is a measure of temperature. RTDs depend on the fact that the
resistance of any metal increases as the temperature increases.
When configured to use RTDs, Weschler BarGraphs provide a fixed current source to drive the
RTD. When configured to work with thermocouples, Weschler BarGraphs have internal cold junc-
tion compensation and ice point reference. The BarGarph is linearized for the specified thermo-
couple (J, K, or T) on the order.
Hysteresis
Instrument hysteresis (deadband) can be set at 0.5%, 1%, or 2% of full scale. The hysteresis setting
provides a faster or slower response to the trend indicators and setpoints. Other values are possible;
please contact the factory for special requirements.
Retransmit (Option)
The BarGraph provides a retransmitted signal (4-20 mA, 0-1 mA, 1-5 VDC, or 0-1 VDC) directly
proportional to the zero and full scale of the LED bar indicator. All retransmit signals are factory-set
and only need to be verified at installation, even if the input is rescaled.
Peak/Valley (Option)
The Peak/Valley option allows the BarGraph to display the highest (Peak) and lowest (Valley) levels
during the reading cycle, as determined by the reset.
Power
All BarGraphs have self-contained power supplies which can be powered by 120/240VAC (50/60/
400Hz). DC-powered Bar Graphs can be powered by 5 V (±5%) @ 400 mA, 8 to 50 V, 125 V, or
250V(+10%).Instrumentisolationisaccomplished via the power supply transformer for AC sources.
Differential input signal conditioning provides common mode rejection of greater than 80 dB.

5
3 INSTALLATION
Remove the BarGraph instrument from its packing container. Check to make sure that the
BARGRAPH LABEL (shown below) on the BarGraph and packing container are identical. Verify
that the BarGraph number received is what is required for your application. Please verify this num-
ber with your purchase order.
Warning: insure that the proper inputs and options were ordered and
received. Connecting a BarGraph in the wrong application may cause dam-
age to the instrument!
Verification
Meter Label
Mounting
1. Securely mount the BarGraph to the panel using the hardware provided. Panel cutout dimen-
sions for each model are provided in Appendix V.
Torque requirements for BG-241, BG-251, BG-261 and BG-281 are 65-70 inch-pounds maxi-
mum.
For BG-252, tighten the screw no more than two turns after the screw point contacts the panel.
2. BG-252 Only: Install the meter trim to the front bezel.

6
Electrical Hookup
Electrical connections should be made after the BarGraph has been mounted. Refer to terminal
connection diagrams in Appendix II.
1. Connect the power supply to the appropriately labeled terminals. The proper power supply
depends on the model BarGraph ordered. Available power supply options are:
• 120 VAC
• 240 VAC
• 5-12 VDC
• 13-50 VDC
• 110-170 VDC
• 110-250 VDC
2. Connect the signal input leads to the proper terminals. The proper input terminals depend on the
model BarGraph ordered. Available input options are:
Input 1 - Voltage or Current, AC or DC
Input 2 - RTD, Magnetic Pickup, J, K, or T Thermocouples
Input 3 - Frequency
Input 4 - 3-phase voltage or current
3. If the retransmit option was ordered, connect the analog retransmit signal output. Output levels
of the retransmit option depend on the model BarGraph ordered. Available output level options
are:
• 4-20 mADC
• 0-1 mADC
• 1-5 VDC
• 0-1 VDC
3. If the serial communication option was ordered, connect the communication transmit and re-
ceive lines. Output levels of the serial communication option depend on the option ordered.
Available input/output options are:
• RS-232
• RS-422
• RS-485
4. If alarm setpoint options were ordered, connect the appropriate lines to the setpoint options.
Setpoint connections are clearly labeled for C (common), NO (normally open) and NC (nor-
mally closed. These connections are made to Form C relays within the BarGraph.

7
4 SETUP
Normal Display Operation
The bar and digital displays provide visual analog indication of the process signal. When the in-
coming signal is below the bottom end of the bar display, the first LED and the digital display flash
at a 1 Hz rate, indicating an underrange condition. When the process signal exceeds the full scale
value, the top LED and the digital display flash at a 1 Hz rate, indicating an overrange condition.
The bar and digital display can be inhibited from flashing in the underrange/overrange condition by
installing a permanent jumper on JA6. See Appendix IV, Circuit Board Layout Drawings, for the
locations of jumpers.
Display Operation During Setup
During setup programming, the bar and digital displays provide information to the user for pro-
gramming. The digital display is used to show simple 2-number abbreviations and numeric values
for each of the setup functions and the bar display is used to provide an analog indication of func-
tions and function values.
Information from the user is input through pushbuttons on the front panel of your BarGraph. To
access these pushbuttons on the BG-251, BG-261 and BG-281, the front cover must be removed.
There are three pushbuttons: INCREASE ( ), DECREASE ( ) and ENTER/SAVE ( ).

8
Operator and Supervisor Setup
Setup functions are divided into two separate classes: Operator and Supervisor.
Operator Setup functions are those that may need to be changed on a routine basis for normal
operation of the instrument. These functions include only the alarm setpoints. Alarm setpoint pro-
gramming may be disabled under Supervisor Setup.
Supervisor functions are those that should be setup only once when the instrument is installed and
may cause damage to equipment or faulty operation if changed inadvertently. These functions
include calibration settings, retransmit ID settings and bar display modes.
Supervisor Setup functions may only be programmed by installing a jumper at JA1.

9
4.1 OPERATOR SETUP PROGRAMMING
Activating Operator Setup
If Operator Setup was enabled under Supervisor Setup (see Section 4.2 for details), pressing the
red ENTER pushbutton and holding it for more than 3 seconds activates Operator Setup without
installing a jumper at JA1.
When operator setup is first enabled, the first function available is displayed on the digital display.
This is the point at which the user both enters and leaves Operator Setup. While continuing to hold
the ENTER ( ) key, press the INCREASE ( ) or DECREASE ( ) keys to cycle through the
available alarm settings.
Operator Setup Actions
Operator Setup allows alarm setpoint values to be changed. Note that the number of alarm setpoints
available depends on the particular model BarGraph™ ordered.
Operator Setup functions are cycled through using the INCREASE and DECREASE keys while
still holding the ENTER/SAVE key. A particular function can be programmed by releasing the
ENTER/SAVE key. Pressing the DECREASE key while 00 is displayed will go to 04 and press-
ing the INCREASE key while 04 is displayed will go to 00.
Previous
Function
00
01
02
03
04
Release to leave Operator Setup
Release toadjustHi-Hialarmsetpoint
Release to adjust Hi alarm setpoint
Release to adjust Lo alarm setpoint
Release to adjust Lo-Lo alarm setpoint
Next
Function
(Holding)
Releasing the ENTER key while any of the above are displayed will display the current setting and
allow it to be modified. Setting each of the above functions is described on the following pages.

10
Alarm Setpoints
Press
ENTER
To save the new setpoint value, press the ENTER key. The display will momen-
tarily show the next setpoint code before displaying its value and allowing it to be
changed. In this way, all alarm setpoints may be examined and changed.
Press
INCREASE
DECREASE
INCREASE and DECREASE keys are used to change the setpoint value. Hold it
until the new setpoint value is reached.
The longer the key is held, the faster the display moves to the required location.
Release ENTER/SAVE to display and change the current setpoint value. The bar
and digital displays both indicate current setpoint value.
Release
ENTER
Press
INCREASE
DECREASE
Continue to hold ENTER/SAVE and press INCREASE or DECREASE until the
desired setpoint code is displayed.
Press and Hold
ENTER
After 3 seconds, the display will show 01 to indicate that Operator Setup mode has
been entered.
•01 - Hi-Hi Setpoint
•02 - Hi Setpoint
•03 - Lo Setpoint
•04 - Lo-Lo Setpoint
Up to four alarm setpoints are provided, depending on the exact model of BarGraph™ ordered and
the options supplied. Each of the available setpoints may be programmed for a specific value under
Operator Setup if enabled (see Enable/Disable Operator Setup in Section 4.2).
NOTES
If the BarGraph™is in 01 through 04 and no keys are pressed for 45 seconds, the BarGraph™
reverts to the normal display.
In Operator Setup mode, only the bar and digital displays are affected. All signal processing
functions continue to operate at the current setup values. Thus, if you are using the setpoint
form "C" relays or retransmit capabilities, they continue to function as if the BarGraph™was in
the normal display mode.
NOTE: Do not assume that the new value is saved once you have arrived at the
new setpoint value and the BarGraph™defaults to normal display mode. You
must press ENTER to store the new setpoint value and make it effective.

4.1.1 FAILSAFE SETPOINT SETUP PROCEDURE
For Models Ordered with Failsafe Setpoint Option Only
The failsafe setpoint feature takes advantage of the inversion of operation when low alarms are used as high alarms
and high alarms are used as low alarms. This may be a bit confusing, but once understood, is completely logical. Note
that special software is required for the hysteresis to operate properly with failsafe relays.
High Setpoint
The low alarm energizes (picks up) the relay whenever the signal is below its setpoint value and deenergizes (drops
out) the relay whenever the signal is above its setpoint. Thus, if the low alarm setpoint value is set to what would
normally be the high setpoint value, when the signal exceeds the setpoint the relay will drop out and when the signal
drops below the setpoint value the relay will pick up. Connecting an external device to the relay’s normally closed
contact will provide an open contact when the signal is below the setpoint and a closed contact when the setpoint is
exceeded OR the relay fails. This is the definition of a failsafe high setpoint.
The High-High setpoint value and the Lo setpoint value must be set to the same desired high setpoint value.
This ensures that the high setpoint annunciator on the bar display tracks the high failsafe alarm. Connections to
the normally closed relay contact of two BG-252 models are made with respect to figure 4.1.1 below. Other BG
models are connected in a similar fashion.
Low Setpoint
The high alarm energizes (picks up) the relay whenever the signal is above its setpoint value and deenergizes (drops
out) the relay whenever the signal is below its setpoint. Thus, if the high alarm setpoint value is set to what would
normally be the low setpoint value, when the signal drops below the setpoint the relay will drop out and when the
signal exceeds the setpoint value the relay will pick up. Connecting an external device to the relay’s normally closed
contact will provide an open contact when the signal is above the setpoint and a closed contact when the signal is
below the setpoint OR the relay fails. This is the definition of a failsafe high setpoint.
The LoLo setpoint value and the Hi setpoint value must be set to the same desired high setpoint value. This
ensures that the low setpoint annunciator on the bar display tracks the low failsafe alarm. Connections to the
normally closed relay contact of two BG-252 models are made with respect to figure 4.1.1 below. Other BG
models are connected in a similar fashion.
Figure 4.1.1 Connections to BG-252 Failsafe Relays
11

12
4.2 SUPERVISOR SETUP PROGRAMMING
Activating Supervisor Setup
Supervisor Setup can only be activated by installing a jumper on JA1. Refer to Appendix IV,
Circuit Board Layout Drawings, for the location of JA1.
When Supervisor Setup is first enabled, 00 is displayed on the digital display. This is the point at
which the user both enters and leaves Supervisor Setup. No segments on the BarGraph™ display
should be illuminated.
Supervisor Setup Functions
Supervisor Setup allows the following functions. Note that the number of alarms available depends
on the particular model of BarGraph™ display ordered.
Supervisor Setup functions are cycled through using the INCREASE and DECREASE keys. A
particular function can be set by pressing the ENTER key. Pressing the INCREASE key while 14
is displayed will go to 00 and pressing the DECREASE key while 00 is displayed will go to 14.
Next
Function
Previous
Function
00
01
02
03
04
05
06 Configure Hysteresis (if ordered)
Enter and Exit Setup
Configure Alarm 1 (if ordered)
Configure Alarm 2 (if ordered)
Configure Alarm 3 (if ordered)
Configure Alarm 4 (if ordered)
Enable/Disable Peak/Valley (if ordered)
to 14
Next
Page

13
07
08
Calibrate Zero
Calibrate Full-scale
09
10
11
12
13
14
Configure Barform
Enable/disable Operator Setup
Configure Decimal Point Scaling
Configure BarGraph™ Zero
Configure BarGraph™ Full-scale
Set Communication ID
Next
Function
Previous
Function
to 00
Codes 1 through 6; 11, 12, 13 and 14 are only displayed if the respective option was ordered. To
add these capabilities, contact the factory.

14
Up to four alarm setpoints are provided, depending on the exact model of BarGraph™ ordered and
the options supplied. Each of the available setpoints may be programmed for a specific value under
Supervisor Setup.
Alarm Setpoints
Press
INCREASE
DECREASE
Press INCREASE or DECREASE until the desired setpoint code is displayed.
Press ENTER to display and change the current setpoint value. The bar and digital
displays both indicate current setpoint value.
Press
ENTER
Press
INCREASE
DECREASE
Press
ENTER
To save the new setpoint value, press the ENTER key. The display will momen-
tarily show the next setpoint code before displaying its value and allowing it to be
changed. In this way, all alarm setpoints may be examined and changed.
INCREASE and DECREASE keys can be used to change the setpoint value. Hold it
until the new setpoint value is reached.
The longer the key is held, the faster the display moves to the required location.
•01 - Hi-Hi Setpoint
•02 - Hi Setpoint
•03 - Lo Setpoint
•04 - Lo-Lo Setpoint
NOTE: Do not assume that the new value is saved once you have arrived at the
new setpoint value and the BarGraph™defaults to normal display mode. You
must press ENTER to store the new setpoint value and make it effective.

15
Hysteresis may be set to .5, 1.0 or 2.0 % of Full Scale. This function will only be available if the
BarGraph™ was ordered with Relay option.
The display will show the current hysteresis setting.
Press ENTER to store the new setting.
Set Hysteresis
(Option)
Press
ENTER
Press ENTER to store the new setting.
Press
INCREASE
DECREASE
Pressing the INCREASE or DECREASE key will toggle between 0(disabled) and
1(enabled).
Press
ENTER
The display will show 0 (disabled) or 1(enabled) to indicate the current state of
Peak/Valley function.
Press
ENTER
Press
INCREASE
DECREASE
Press
ENTER
Peak/Valley allows the BarGraph™ to display the highest (Peak) and lowest (Valley) level during
the reading cycle, as determined by the reset. This function will only be available if the BarGraph™
was ordered with Peak/Valley option.
Pressing the INCREASE or DECREASE key will increase or decrease the hyster-
esis setting. Pressing INCREASE while at 2.0 will roll over to .5.Pressing DE-
CREASE while at .5 will roll over to 2.0.
Enable/Disable Peak/Valley
(Option)

16
BarGraph™Zero
This is a calibration function. The following steps show how to check the current calibration set-
tings. For a description of how to change the calibration, see section for complete calibration
procedure.
The display will show the current BarGraph™ Full Scale display setting.
If you merely want to examine the settings without changing them, omit the
next step. Pressing the INCREASE or DECREASE keys at this point will change
the Full Scale setting!
BarGraph™Full Scale
Press ENTER to advance to the next function (Set Barform).
Press
ENTER
Press
INCREASE
DECREASE
Press
ENTER
Press
ENTER
Press
ENTER
Pressing the INCREASE or DECREASE keys will change the calibration settings.
See section for a complete description of calibration.
The display will show the current BarGraph™ zero.
If you merely want to examine the settings without changing them, omit the
next step. Pressing the INCREASE or DECREASE keys at this point will change
the Zero setting!
Press ENTER to advance to the next function (BarGraph™ Full Scale).
Pressing the INCREASE or DECREASE keys will change the calibration settings.
See section for a complete description of calibration.
Press
INCREASE
DECREASE
This is a calibration function. The following steps show how to check the current calibration set-
tings. For a description of how to change the calibration, see section for complete calibration
procedure.

17
Set Barform
Pressing the INCREASE or DECREASE key will cycle through the barform op-
tions shown below.
Next
Barform
Previous
Barform
Bottom 0. BarGraph™ reads 0% of Full Scale at the bottom and increasing
up to 100% of Full Scale at the top.
Zero point at 25% of bar display. BarGraph™ reads -25% of bar display at
the bottom and increases up to +75% at the top.
Zero point at 33% of bar display. BarGraph™ reads -33% of bar display at
the bottom and increases up to +66% at the top.
4Zero point at 100% of bar display. This effectively reverses the bar display,
with 100% of Full Scale at the bottom of bar display and 0% of Full Scale at
the top.
Press
INCREASE
DECREASE
Press
ENTER
This function allows the user to set the display format. The most common display format is bottom
zero, ie; starts at the bottom (or left) and increasing up (or to the right). The BarGraph™ zero point
can be located or referenced anywhere on or off the scale in this setup.
The display will show the current barform. Options for barform and the order they
appear in are shown below.
Press
ENTER
0
1
2
3Zero point at 50% of bar display (Center Zero). BarGraph™ reads -50% of
Full Scale at the bottom and increases up to +50% at the top. Positive values
are displayed as a bar that extends from center of display up; negative values
as a bar from center of display down.
Press ENTER to store the new barform setting.
Deviation allows the user to set a bar display center point at any arbitrary
value and display + or - variations around that center point. The value set with
BarGraph™ Zero function is displayed at the center of bar display, with - Bar
Full Scale at the bottom of display and + Bar Full Scale at the top of bar
display. Values greater than BarGraph™ Zero are displayed as a bar that ex-
tends from center of display up; values less than BarGraph™ Zero as a bar
from center of display down. (see Set Bar Zero and Set Bar Full Scale)
Variable allows the user to set any arbitrary values for the bottom and top of
bar display (see Set Bar Zero and Set Bar Full Scale).
Bipolar (Wraparound) - For positive values the zero point is at the bottom of
display and reads to 100 % of FullScale at the top of display. For negative
values the zero point is at the top of display and reads to -100 % of FullScale
at the bottom of display.
5
6
7