Omni Instruments TR150 User manual

TR150
Portable Battery
Powered Indicator
Instruction Manual
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1
CONTENTS
INTRODUCTION .................................................................................................................2
USER OPERATION .........................................................................................................2
Electrical Connection Information.....................................................................................3
Sensor Connections .....................................................................................................3
RS232 Port Connections ..............................................................................................3
Internal Connections.....................................................................................................3
MENU STRUCTURE........................................................................................................5
CONFIGURATION MENU................................................................................................7
CALIBRATION MENU......................................................................................................9
Operation Features ........................................................................................................10
Normal Display Operation...........................................................................................10
Switching the TR150 On/Off .......................................................................................10
RANGE Button ...........................................................................................................10
HOLD Button ..............................................................................................................11
GROSS/NET Button ...................................................................................................11
SHUNT CAL Button....................................................................................................11
PEAK Button...............................................................................................................11
TROUGH Button.........................................................................................................11
CONFIGURATION MENU Parameters ..........................................................................12
CALIBRATION MENU Parameters ................................................................................14
Calibration Procedures ...............................................................................................15
Specifications .................................................................................................................17
Mechanical Dimensions .................................................................................................17
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2
INTRODUCTION
The TR150 Portable Strain Display Load Cell/Force transducer readout is a
microprocessor based portable instrument designed to interface with any full bridge sensor
with an output sensitivity of up to 50mV/V. Bridge resistances from 85Ωupwards can be
used with the TR150.
Configuration and calibration of the TR150 is achieved using the front panel push buttons
to navigate through a very simple menu structure.
User functions available on the TR150 include:-
•Range Selection
•Display Hold/Freeze
•Gross/Net indication selection
•Peak Hold selection
•Trough Hold selection
•Shunt Cal check
The TR150 is powered by two internal non-rechargeable AA alkaline batteries.
There is an option to have rechargeable alkaline batteries, which can be charged without
the need for removing them from the TR150.
USER OPERATION
Important Note
The unit is supplied calibrated to a particular load cell. All user functions are available via
the front keypad. Do not attempt to re-calibrate the TR150, unless you are authorised and
have the equipment available to do so.
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3
Electrical Connection Information
Sensor Connections
The standard sensor connection is a 5 pin 723 series Binder connector. The sensor
connector is also used as a charging socket when the re-chargeable alkaline battery
option has been ordered. The wiring of the socket is detailed below:-
PIN 1 +ve Excitation
PIN 2 -ve Excitation & -ve Charge Input
PIN 3 +ve Signal
PIN 4 -ve Signal
PIN 5 +ve Charge Input
RS232 Port Connections
If the TR150 has been ordered with the optional RS232 output, then this will be available
via an 8 pin 723 series Binder connector. The wiring for this is detailed below:-
PIN 1 Tx
PIN 2 Rx
PIN 3 Gnd
Internal Connections
It may be necessary from time to time to know what the internal connections are. For
example, if you disturb some of the connections whilst trying to insert the range legends,
or if you need to change the internal shunt calibration resistor. These are shown below for
reference only:-

4
There are six push buttons on the front panel of the TR150, which are available for use in
normal operation. Each of these is described below:-
Front Panel
Button Function of Button in Normal Operation Mode
To switch the TR150 ON or OFF press and hold the button.
The RANGE button allows the user to toggle between two
independent scales. The range that has been selected is
highlighted by an annunciator.
The HOLD button allows you to hold/freeze the current display
value when the button is pressed. Pressing the HOLD button
again releases the display. The HOLD annunciator is illuminated
when in the HOLD mode, and the display will flash to warn that
the user is not viewing instantaneous display values.
The GROSS/NET button, when pressed, allows the user to
toggle between Gross or Net display values. This can be useful
in many applications where it is necessary to display the change
in value from a certain part of the measurement range. When in
NET mode the NET annunciator is lit. When in GROSS mode,
the NET annunciator is not lit.
The SHUNT CAL button can be pressed by the user at any point
in time. The standard unit shunts a 100kresistor across the
negative excitation and negative signal connections. If this is
performed at the end of the calibration procedure, then a figure
can be noted so the user can check calibration accuracy or
connection integrity. The button has to be held down to operate.
When held down the SHUNT CAL annunciator is lit and the
display will flash to warn that the user is not viewing
instantaneous display values.
When the PEAK button is pressed, the display will show the last
Peak reading. To reset the Peak reading, press the PEAK and
TROUGH buttons simultaneously. When in PEAK mode, the
PEAK annunciator will be lit and the display will flash to warn
that the user is not viewing instantaneous display values. To turn
off Peak mode, press the PEAK button again.
When the TROUGH button is pressed, the display will show the
last Trough reading. To reset the Trough reading, press the
PEAK and TROUGH buttons simultaneously. When in TROUGH
mode, the TROUGH annunciator will be lit and the display will
flash to warn that the user is not viewing instantaneous display
values. To turn off Trough mode, press the TROUGH button
again.
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5
MENU STRUCTURE
The TR150 has two menus, details of which are outlined below:-
A CONFIGURATION MENU enables the user to tailor the operation to meet a specific
application requirement. The values selected in the CONFIGURATION MENU are
completely independent for each range.
SEt ZErO 0000000
SEt rAtE
SEt OUEr
SEt OPEr
AutO OFF
rS232
25? 10? 3? 1? 0.5?
0000000
PSAVE?
00
EnAbLEd?
RETURN TO
NORMAL DISPLAY
MODE
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6
A CALIBRATION MENU is used to calibrate each of the two ranges with independent scales, as well as setting the display resolution for
each range.
SEnS 5.0
SEt rES
CALibrAt LiVE?
RETURN TO
NORMAL DISPLAY
MODE
0000.000
uSE SC? APPLY LO dISP LO 0000000 APPLY HI dISP HI 0000000 donE
APPLY LO dISP LO 0000000 dISP HI 0000000 donE
tAbLE? InPut LO 0000000 dISP LO 0000000 InPut HI 0000000 dISP HI 0000000 donE
CAL VAL? SEt 9Ain 0000000 SEt OFFS donE
0000000
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7
CONFIGURATION MENU
To enter the CONFIGURATION MENU, press and hold
and buttons for 3 seconds.
Parameter Set-up Information
SEt ZEro
PRESS TO SKIP TO NEXT MENU ITEM
PRESS TO SET A NEW SYSTEM ZERO
This allows the user to introduce a fixed offset to the display value. The
GROSS and NET values are then displayed with this offset taken into account.
Values between -9999999 and +9999999 can be entered, using the and
buttons to select a digit and the and buttons to increment or
decrement the digits. Press to accept the value and move onto the next
parameter.
SEt rAtE
PRESS TO SKIP TO NEXT MENU ITEM
PRESS TO CHANGE THE UPDATE RATE
This allows the user to set the display update rate. The options available are
the update rates of the display in Hz. Please note that the 25Hz update is only
available in PEAK or TROUGH mode.
When you choose to change the update rate, you will be prompted whether
you want to select 25Hz. If you do not, press . You will then be prompted to
select any of the other values which, in order, are 10Hz, 3Hz, 1Hz, 0.5Hz. To
set the update rate for the value you want, press .
SEt
OUEr
PRESS TO SKIP TO NEXT MENU ITEM
PRESS TO SET OVERLOAD ALARM
This allows the setting of a visual overload. The value entered is the display
value at which the TR150 flashes OUErLOAd.
Values between -9999999 and +9999999 can be entered, using the and
buttons to select a digit and the and buttons to increment or
decrement the digits. Press to accept the value and move onto the next
parameter.
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8
Parameter Set-up Information
SEt
OPEr
PRESS TO SKIP TO NEXT MENU ITEM
PRESS TO SELECT OPERATION MODE
This allows the enabling or disabling of the power save mode, which updates at
1 reading per second and pulses the sensor excitation. This results in a lower
accuracy (1 digit in 10,000).
To enable press .
To disable press
AUtO
OFF
PRESS TO SKIP TO NEXT MENU ITEM
PRESS TO SET AUTO POWER OFF
This enables the setting of an auto power off value. The value entered is in
minutes. If no front panel buttons are pressed for the time set here, then the
indicator will automatically power off to conserve battery life.
Values between 05 and 99 can be entered (00 leaves the TR150 permanently
powered), using the and buttons to select a digit and the and
buttons to increment or decrement the digits. Press to accept the value and
move onto the next parameter.
rS232
PRESS TO SKIP THIS PARAMETER AND EXIT MENU
PRESS TO ENABLE THE RS232 OUTPUT
This feature allows you to enable or disable the RS232 output. Further details
of the RS232 format are provided on page 13 of this manual. The RS232
output is an option that has to be ordered with the TR150. To conserve battery
life, it is suggested that the RS232 output is disabled when it is not required.
To enable press .
To disable press
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9
CALIBRATION MENU
To enter the CALIBRATION MENU, press and hold
and buttons for 5 seconds.
Parameter Set-up Information
SEnS 5.0
PRESS TO SKIP TO NEXT MENU ITEM
PRESS TO CHANGE SENSOR INPUT SENSITIVITY
This allows the calibration engineer to change the sensitivity range of the
TR150 when connecting to sensors with an output of greater than 5mV/V. The
TR150 is factory set for 5mV/V. To ensure the unit is set to 5mV/V press .
To select 50mV/V, you need to power down the unit and access the internal
circuit board. Move link LK1 and place it onto JP1. Power on the TR150 and
return to this point of the calibration menu. You will notice that the menu
parameter has changed to SEnS 50.0. Press to change the sensitivity to
50mV/V and move on to the next parameter.
SEt rES
PRESS TO SKIP TO NEXT MENU ITEM
PRESS TO THE SET THE DISPLAY RESOLUTION
This parameter sets the decimal point position for the display and the
resolution, i.e. a value of 000.005 would display the reading to 3 decimal
places and the readings will change in steps of 0.005.
The decimal point position is moved one place to the right each time you press
the and together.
Any value can be entered for the resolution, using the and buttons to
select a digit and the and buttons to increment or decrement the digits.
Press to accept the value and move onto the next parameter.
To save the settings and move on to the next parameter press .
CALibrAt
PRESS TO SKIP THIS PARAMETER AND EXIT MENU
PRESS TO THE ENTER THE CALIBRATION ROUTINE
If you have chosen to enter the calibration routine, you will be prompted
whether you want to select LiVE. If you do not, press ; otherwise press .
You will then be prompted to select either of the other calibration methods
which, in order, are tAbLE and CAL VAL . To select any of the calibration
methods, press ; otherwise press .
For more detailed calibration information, please refer to the calibration section
of the manual.
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10
Operation Features
Normal Display Operation
The TR150 has a full 7 digit display, which can be scaled using the calibration menu to suit the
application in which it is to be used. The display can show the instantaneous, peak or trough
values. It is also possible to hold the displayed value (this only operates when not in peak or
trough modes).
The display update rate, decimal point position and resolution can be set to suit.
The TR150 has two independent ranges. All values set in one range are totally independent
from the other.
Switching the TR150 On/Off
The TR150 is switched ON or OFF by pressing and holding down the button for 3 seconds.
It is also possible to set an Auto-off value in the configuration menu, so that the TR150
automatically switches itself off if there is no keyboard activity within a preset time.
RANGE Button
The range feature allows for one of two totally independent setup ranges to be selected. To
switch between ranges simply press the range button.
When you enter either the calibration menu or configuration menu, the parameters you will be
setting are those for the range you have selected. An annunciator is lit to identify which range
has been selected.
The TR150 is supplied with engineering unit legends; these can be slid into a window, located
on the inside of the front panel. These labels then help to further identify the units being
displayed for each range. Please refer to the photo below:-

11
HOLD Button
The hold button allows the user to freeze the display as it is pressed. When pressed again the
display returns to its normal operating mode. When in hold mode, the display will flash and the
hold annunciator will be lit, to ensure that this feature is not accidentally turned on without the
user noticing.
The hold feature cannot be used when the TR150 is in either peak or trough modes.
GROSS/NET Button
The gross/net button, when pressed, toggles between the gross and net display values. This
enables the user to zero the display (by putting the TR150 into net mode) and show the change
in readings from that point.
This is useful for certain weighing applications where a tare weight exists, which can be
removed by putting the TR150 into net mode.
SHUNT CAL Button
The shunt calibration button, when pressed, puts an internal 100kresistor across the –ve
excitation and –ve signal of the sensor, generating a simulated output from the sensor and
therefore giving a simulated display value. This can be pressed immediately after the sensor
has been calibrated with the TR150 and noted down for later reference. The value noted can be
used to get an idea of the calibration accuracy at a later date, or for checking the integrity of the
sensor and sensor cabling.
The shunt calibration resistor can be changed to suit specific requirements. It is suggested that
a 15ppm ±0.1% tolerance resistor is used.
PEAK Button
When pressed, this button puts the TR150 into peak mode. This will show the highest reading
and hold it on the display until it is reset or a higher value is reached. To reset the display, press
the peak and trough buttons simultaneously. In peak mode, it is possible to capture peaks at a
rate of up to 25Hz. To turn off the peak mode, press the peak button again.
TROUGH Button
When pressed, this button puts the TR150 into trough mode. This will show the lowest reading
and hold it on the display until it is reset or a lower value is reached. To reset the display, press
the peak and trough buttons simultaneously. In trough mode, it is possible to capture troughs at
a rate of up to 25Hz. To turn off the trough mode, press the trough button again.
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12
CONFIGURATION MENU Parameters
SEt ZEro Parameter
The SEt ZEro parameter is meant to be accessible to the user. It allows the removal of fixed
offset values from the display, so that the GROSS and NET features can operate from a zero
point. This may also be considered as a manual tare facility. To zero the display, simply enter
the value that you wish to subtract from the display in the SEt Zero parameter. i.e. if the display
reads 000.103 and you wish it to read 000.000, then enter 000.103 in the SEt ZEro parameter.
Different values can be set for each RANGE.
SEt rAtE Parameter
The SEt rAtE value sets the display update rate. The options available are 25Hz, 10Hz, 3Hz,
1Hz and 0.5Hz. Different updates rates can be set for each RANGE.
The 25Hz rate only updates at this rate when in the PEAK or TROUGH modes. When in normal
display mode, it has been limited to a 3Hz update as the digit fluctuations are impossible to view
with the human eye.
The 10Hz, 3Hz, 1Hz and 0.5Hz rates update the display every 100mS, 300mS, 1000mS and
2000mS respectively. The TR150, when it leaves the factory, is set at 3Hz.
SEt OVEr Parameter
The SEt OVEr parameter allows the user to set a visual alarm. The value that is entered is the
display value at which you want the alarm to activate. When the alarm is activated, the word
OVErLOad appears in the display. To remove the alarm, the display value must be reduced to
a value that is lower than that set in the SEt OVEr parameter. This can be very useful as a
safety feature, or simply as a quick indication of when a preset level has been reached.
The value entered can be anywhere over the entire display range, so there are no limitations.
Different values and settings are available for each RANGE.
SEt OPEr Parameter
The TR150 has a special power saving mode, which can be enabled or disabled within this
parameter. When asked whether you wish to select P SAvE? , pressing will put the TR150
into power save mode for the RANGE selected. Pressing will de-activate the power save
facility.
When the power save facility is activated, battery life is conserved by pulsing on the excitation
voltage to the sensor. As a result the accuracy is reduced, as is the update rate. When in this
mode, the quickest update rate is 3Hz and the accuracy of the display is reduced to 1 digit in
10,000. It is important to note these limitations when deciding whether to use the power save
facility. However, it is also possible to set one RANGE with power save activated and the other
without.
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13
The benefit is that the battery life, based on a 350sensor bridge being connected, increases
from 45 hours to 450 hours.
It is also important to remember that when the TR150 is re-calibrated with a sensor, the power
save facility will be automatically turned off. If required, the power save facility will therefore
need to be re-activated after calibration has been completed.
AUtO OFF Parameter
The AUtO OFF parameter is another power saving feature. It allows for the setting of a time
period in minutes, between 05 and 99 (00 de-activates AUtO OFF) ie. if this was set to 25, then
if the TR150 detects no keyboard activity for a continuous 25 minute period, then the TR150 will
switch itself off to conserve power. If any keyboard activity is detected during the 25 minutes,
then the time period is restarted.
This can be a useful feature in a site environment, should the TR150 be left unintentionally
powered on.
rS232 Parameter
This parameter allows the user to enable the RS232 output from the TR150, by pressing
when prompted by EnAbLEd? on the display. Pressing will disable the RS232.
The output format is ASCII. The display value is passed to the RS232 port each time the display
updates, with a carriage return at the end of each data string. The string information is as
follows:-
Baud Rate = 9600 baud
Stop bits = 1
Parity = None
Data bits = 8
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14
CALIBRATION MENU Parameters
SEnS 5.0 Parameter
The TR150 is factory set to enable calibration with sensors generating an output signal of
5mV/V or less. In the majority of cases, it will not be necessary to read higher signal levels. If,
however, a higher sensitivity sensor is used with the TR150, it will be necessary to gain access
to the internal PCB (you must turn the TR150 off) to move link LK1 to JP1 (see picture below).
This will allow the TR150 to accept signals of up to 50mV/V.
Once this link has been moved, you will need to go back into the CALIBRATION MENU. When
re-entering the menu, you will notice that the parameter SEnS 5.0 has changed to SEnS 50.0 .
To change the sensitivity to 50mV/V, press . The TR150 will now check the position of the
link and change the sensitivity. It will now be necessary to re-calibrate any sensors that you may
previously have calibrated to this instrument.
SEt rES Parameter
This parameter enables the setting of two features on the TR150. It allows you to set the
decimal point position of the display, by pressing the and together, to move the point
position (each press moves the decimal point position one place to the right).
It also allows for the setting of the display resolution or the number of display counts the display
changes with an input change. To change the resolution, use the and buttons to select
the digit you want to change and the and buttons to increment or decrement the digits.
Press to accept the value.
CALibrAt Parameter
This parameter is used to calibrate and scale the TR150 with a sensor. There are two basic
methods of calibration available. These are LiVE and tAbLE. There is also a third parameter
which can be used for maintenance and recording purposes. This parameter is CAL VAL. The
CAL VAL value can be viewed after a calibration has been completed and will show the offset
and gain figures from any stored calibration. If these figures are noted, they can be used to re-
enter at a later date if calibration data is lost for any reason, or if the calibration data from a
sensor needs to be transferred to another TR150.
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15
Calibration Procedures
The best method of calibration, if it is possible to do so, is the LiVE calibration, as this reads in
the sensor signal at two calibration points and scales the TR150 automatically. If this is not
possible, then the sensitivity figure (in mV/V) from the sensor calibration certificate can be used
to scale the TR150, by using the tAbLE calibration. This may be the only option available if you
are unable to apply a known stimulus to the sensor, which quite often is the case.
LiVE Calibration Procedure
(1) When CALibrAt is displayed, press .
(2) LiVE ? will now be displayed. Press .
(3) You will be prompted uSE SC ?. This can be selected if you wish to use the shunt
calibration figure from a sensor calibration certificate (care should be taken that the
shunt calibration resistor used originally with the sensor is the same as is fitted in
the TR150). If you wish to use this, press ; otherwise press .
(4) You will then be prompted with APPLY LO. At this point, ensure that the low
calibration stimulus is applied to the sensor and allow to settle for approx. 3
seconds. Then press .
(5) You will then be prompted with dISP LO. Press and enter the display value
required with the low stimulus applied to the sensor. The value can be entered by
using the and buttons to select a digit and the and buttons to
change the digit. When the value has been set, press .
(6) You will then be prompted with APPLY HI (unless you chose to uSE SC ?, in which
case jump to the next stage) At this point ensure that the high calibration stimulus is
applied to the sensor and allow to settle of approx. 3 seconds, then press .
(7) You will then be prompted with dISP HI. Press and enter the display value
required with the high stimulus applied to the sensor. The value can be entered by
using the and buttons to select a digit and the and buttons to
change the digit. When the value has been set, press .
(8) You should now see donE displayed. This means the calibration was successful.
Press to return the TR150 to normal operation mode, with the new calibration
data stored. If you see FaiLEd , then you will need to repeat the calibration,
checking that you have completed the procedure in the correct order, and that the
sensor is connected correctly.
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16
tAbLE Calibration Procedure
(1) When CALibrAt is displayed, press .
(2) LiVE ? will now be displayed. Press .
(3) tAbLE ? will now be displayed. Press .
(4) You will be prompted with InPut LO. Press .
(5) Now enter the zero offset sensitivity of the sensor by using the and buttons
to select a digit and the and buttons to change the digit. When the value has
been set, press . If you do not know this, simply enter all zeros.
(6) You will then be prompted with dISP LO. Press to enter the display value
required for the low input figure entered. The value can be entered by using the
and buttons to select a digit and the and buttons to change the digit.
When the value has been set, press .
(7) You will then be prompted with InPut HI. Press .
(8) Now enter the sensitivity figure supplied for the sensor by using the and
buttons to select a digit and the and buttons to change the digit. When the
value has been set, press .
(9) You will then be prompted with dISP HI. Press to enter the display value
required for the high input figure entered. The value can be entered by using the
and buttons to select a digit and the and buttons to change the digit.
When the value has been set, press .
(10) You should now see donE displayed. This means the calibration was successful.
Press to return the TR150 to normal operation mode, with the new calibration
data stored. If you see FaiLEd, then you will need to repeat the calibration,
checking that you have completed the procedure in the correct order, and that the
sensor is connected correctly.
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17
Specifications
Performance Input Type: Strain Gauge Full Bridge Sensors
Input Range: Up ±5mV/V (±50mV/V can be supplied, with factory set option)
Non Linearity: ±0.005% FSD
Thermal Drift: <5 ppm/°C
Excitation Voltage: 5Vdc (±4%), 59mA maximum current
Minimum Bridge Resistance: 85(4off 350sensors in parallel)
Internal Battery: 2off AA size alkaline, access via sealed rear compartment
Battery Life: 45 hours (Typical 450 hours in low power mode), with 350sensor
Update Rate: Up to 40mS (can be set in configuration menu)
Indication Display Type: 7 digit LCD display, 8.8mm high digits
Display Resolution: 1 part in 250,000 at 1Hz update rate
1 part in 65,000 at 10Hz update rate
Annunciators: Low Battery warning; peak; trough; hold; net; shunt cal; range
Control Variables Front Panel User Keys:
Tactile Keys with recessed rims for:-
ON/OFF Switches TR150 power on/off
RANGE Selects between two ranges
HOLD Hold the current display value, press again to release
GROSS/NET Zero’s display (±100% range)
SHUNT CAL Generates simulated input for indicator testing
PEAK Enables peak hold
TROUGH Enables valley/trough hold
Settable Parameters: Tare/Zero value; display resolution/decimal point position; display
update rate; low power mode; auto power off;
Mechanical Electrical Connection: 5 pin Binder socket (mating plug supplied)
Physical Size: See drawing below
Weight: 260 grams
Legends: Insert legends for engineering unit identification (supplied)
Environmental Operating Temperature: -10°C to +50°C
Environmental Rating: IP65 (when mating plug fitted)
Enclosure Type: ABS, dark grey (Leather Carry Case Optional)
Safety/Low Voltage Directive 73/23/EEC amended by 93/68/EEC To IEC 1010-1:1990, EN
61010 – 1 – 1993 89/336/EEC
EMC Directive EN 50 081 – 1 : 1992 (Light Industrial)
Emissions
EN 50 081 – 2 : 1992 (Heavy Industrial)
pr EN 50 093 : 1991
EMC Emissions
EN 50 082 – 1 :1992 (Light Industrial)
EN 50 082 – 2 :1992 (Heavy Industrial)
Mechanical Dimensions
Lbs
kN
kgf
90
152
34
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USA / Canada Office
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