User
Guide
Quality
Industrial
Weighing
and Force
Measurement
Equipment
Measurement
Systems
International
“SKY-WEIGH”
HELICOPTER CARGO
HOOK LOAD
MONITORING
SYSTEM
MSI150X
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 2 MSI-150X Sky-Weigh • User Guide
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
MSI-150 Sky-Weigh • User Guide Page 3
TABLE OF CONTENTS
CONFIGURATION LOG ......................................4
MSI-150XM SYSTEM DESCRIPTION ...............4
MSI-150XM DESCRIPTION ................................4
Front Controls ................................................... 4
Rear Controls .................................................... 5
Side Controls..................................................... 5
Front Indicators .................................................7
INSTALLATION....................................................7
CALIBRATION .....................................................7
OPERATION .......................................................... 7
INSPECTION.........................................................8
CONNECTOR PIN ASSIGNMENTS....................9
NOTES .................................................................10
THE MSI LIMITED WARRANTY ..................... 11
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 4 MSI-150X Sky-Weigh • User Guide
CONFIGURATION LOG
Meter Serial Number
Load Cell Serial Number
Calibration Number
Dip Switch Setting:
MSI-150XM SYSTEM DESCRIPTION
The MSI-150XM system is designed for the recording and/or monitoring of
external loads encountered in helicopter lift operations. The basic MSI-150XM
system consists of a weight sensor (load cell) and a digital weight indicator. An
optional hand held or panel mounted thermal printer (MSI-150XP) may be
interfaced to provide a permanent record of the lift operations. The system is
designed to record/monitor loads up to 30,000 lb/15,000 kg.
MSI-150XM DESCRIPTION
The MSI-150XM weight indicator performs signal conditioning on the low level
signal received from the weight sensor then displays the sensed weight on a
liquid crystal display (LCD).
Front Controls
TEST: When the Test button is depressed, an automated self-test sequence is
performed by the internal computer. The liquid crystal display will sequence
through the following:
1) All LCD segments on for approximately 3 seconds.
2) All LCD segments off for approximately 3 seconds.
3) Instrument calibration number displayed for approximately 3 seconds.
4) Zero offset displayed for approximately 3 seconds. (This is the total
offset which has been previously zeroed out by use of the ZERO button.)
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
MSI-150 Sky-Weigh • User Guide Page 5
5) “X - Y” number displayed. “X” is the filter number (0 - 3) selected by dip
switch settings. “Y” is a computer software version number used to
identify the software program in the weight indicator.
When calibrated with a load sensor at the factory, the indicator will
display the calibration number that is stamped on the load sensor. This
calibration number is displayed during the Test sequencing so that the
correct calibration of the system can be verified. In order to display the
correct calibration number during this sequencing, the indicator must first
be Zeroed.
Depressing and holding the TEST button during the appearance of a
given item in the test sequence will hold that item in place on the display.
Releasing the Test button will allow the sequencing to continue. (i.e.
depressing the Test button during the appearance of the calibration
number holds it in place while allowing the technician to adjust the span
control for recalibration. (See Span Adjustment)
ZERO: The push-button zero switch allows the operator to Zero out a displayed
load. The maximum load the indicator will allow the operator to zero out using
this control is 1200 lb/540 kg with 10 lb/10 kg resolution.
Rear Controls
Rear controls allow for coarse zero adjustment and span adjustment of the
weight indicator.
1) Coarse Zero Adjustment: During installation it is necessary to account
for the weight of the cargo hook and other loads attached to the load
sensor. To accomplish this, adjust the Zero control on the rear of the
indicator with a small screwdriver until the display reads zero.
2) Span Adjustment: When used in conjunction with known test weights
and the proper analog gain control setting, the Span Adjustment is used
to calibrate the MSI-150XM system. This adjustment is set at the factory
and should only be readjusted when it is necessary to re-calibrate the
indicator.
Side Controls
Programming controls not accessible on the front or rear of the weight indicator
are contained in a nine position dip switch located on the side of the
MSI-150XM indicator. This switch is covered by a label that has been marked at
the factory with preset switch positions. This label should not be removed
unless a change to these switch positions is necessary. Spare labels can be
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 6 MSI-150X Sky-Weigh • User Guide
provided by the factory and should be marked and affixed to the indicator.
The switches allow for the selection of the following:
LOAD LEVEL INDICATOR TRIP POINT
DISPLAY UNITS (LBS. OR KGS)
DAMPENING FILTER LEVEL (4 LEVELS PROVIDED)
CALIBRATION VALUE SELECT
ANALOG GAIN
1) Switch 1 - Load Level: The indicator outputs a signal to Pin G of J2
which identifies when a load is being applied to the load cell. The LO
position is 5 lb/5 kg; the HI position is 10 lb/10 kg. A weight which
exceeds these values allow Pin G to sink up to 300ma to ground (open
collector signal).
2) Switch 2 - Display Units: Selects the display units as pounds or kilograms. An arrow on the front panel display identifies the units selected.
3) Switch 3 & 4 - Dampening Filter: When used in combination, the
switches select the level of motion dampening (4 levels). A filter number
which appears during the Test sequence identifies the dampening level
selected.
Filter 0 - (3 open/4 open) no dampening
Filter 1 - (3 open/4 closed) light dampening
Filter 2 - (3 closed/4 open) medium dampening
Filter 3 - (3 closed/4 closed) heavy dampening
4) Switch 5 - Calibration Value Select: Selects one of two calibration
numbers. The switch has been set at the factory and should not be
changed. The correct calibration number (found at the front of this
manual and on the load cell serial number tag next to CAL) will only
appear if the indicator is at zero when the Test button is depressed.
Recalibration (adjustment to the rear Span control) will change this
number. The new number should be recorded. Recalibration is necessary
when new printed circuit boards or load cells are installed.
5) Switch 6, 7, 8, & 9 - Analog Gain: Adjusts the indicator span sensitivity
to accommodate various types of load cells. This switch has been set at
the factory. There should be no need to change it unless the indicator is
used with a different type of load cell. Changing the analog gain is only
necessary when there is insufficient span adjustment to calibrate the
indicator. Only one switch is closed at any one time.
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
MSI-150 Sky-Weigh • User Guide Page 7
Front Indicators
LB/KG Indicator: The MSI-150XM will display the weight in pounds or
kilograms as selected by Switch 2 of the 9 position dip switch on the side of the
instrument. The selected units are indicated by one of two pointers to the left of
the liquid crystal display.
INSTALLATION
Install the system in accordance with the installation drawing(s) provided.
Warning: After load cell/hook installation, move the hook to all positions to
insure that there is no interference with electrical/mechanical release cables.
Prior to inserting the indicator in the instrument panel, perform a “Power-On”
check to assure that the meter performs a proper TEST sequence.
CALIBRATION
The system has been factory calibrated using known weights. A periodic
calibration check should be performed by lifting a known weight (at least one
half capacity). If recalibration is required, the following procedures should be
followed:
1) Place the instrument in a position which permits access to the rear
controls.
2) Apply power and zero the unit with the rear Zero control screw.
3) Without the known weight applied, lift all slings, long line etc. to be
utilized in the lift and allow the display to stabilize then depress the Zero
control screw. This allows net weight calibration of the known weight.
4) Lift the known weight, allow the reading to stabilize then adjust the rear
Span adjustment until the known weight is indicated.
5) Remove the known weight. If the indicator returns to zero, the calibration is complete. If not, repeat steps 3 through 5.
OPERATION
1) Prior to each flight, visually inspect the load cell and attachments for
any obvious signs of wear or loose connections.
2) At power application, the indicator will automatically perform its Test
sequence.
3) With all lifting slings, long line etc. attached, depress ZERO control and
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 8 MSI-150X Sky-Weigh • User Guide
perform test sequence to verify calibration (net weight operation). (If
gross weight operation is desired, any weight not zeroed will be added to
the calibration number when displayed during Test sequence.)
INSPECTION
The load cell and attachment bolts should be inspected during each hook
inspection cycle. Bolts showing wear should be replaced. Bushings in the load
cells should be inspected for wear and replaced for out-of-round conditions.
Load cells with out-of-round end fitting holes should be replaced.
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
MSI-150 Sky-Weigh • User Guide Page 9
CONNECTOR PIN ASSIGNMENTS
CONNECTOR J1
PIN NAME USE
A Analog Output Represents analog signal being sensed by the
load cell. Used to drive external indicator(s).
B 28V DC Power for the MSI-150XP or other external
devices.
C MSI-150XP Serial Data Communication link to the MSI-150XP
printer.
D GND Power ground for the 150XP or other
external devices.
CONNECTOR J2
PIN NAME USE
A + Excitation Load cell + power.
B + Signal Load cell + signal.
C - Signal Load cell - signal.
D - Excitation Load cell - power.
E Aircraft Dim Connect to instrument panel backlighting
rheostat for MSI-150XM liquid crystal
display backlighting.
F 28V DC Power for MSI-150XM and 150XP.
G Load on output Output to drive external load on indicator.
Open collector, sinks 300ma.
H Electronic GND Power ground for MSI-150XM and 150XP.
J Chassis GND Connect to quality aircraft ground only if
indicator case is not grounded or if indicator
readings are erratic.
K Chassis GND Connect to quality aircraft ground only if
indicator case is not grounded or if indicator
readings are erratic.
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 10 MSI-150X Sky-Weigh • User Guide
NOTES
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
MSI-150 Sky-Weigh • User Guide Page 11
THE MSI LIMITED WARRANTY
MEASUREMENT SYSTEMS INTERNATIONAL, INC., WARRANTS load sensing
elements and meters against defects in workmanship and materials for a period
of one year from date of purchase and warrants electrical cables and batteries
against the same defects for a period of ninety (90) days from date of purchase.
Any device which proves defective during the warranty period will be replaced
or repaired at no charge; provided that the defective device is returned to the
Company freight prepaid.
In no event shall the Company be liable for the cost of any repairs or alterations
made by others except those repairs or alterations made with its specific
written consent, nor shall the Company be liable for any damages or delays
whether caused by defective workmanship, materials or otherwise.
The Company shall not be liable for any personal injury or property damage
resulting from the handling, possession or use of the equipment by the customer.
The warranty set forth herein is exclusive and is expressly in lieu of all other
warranties, express or implied, including without limitation any implied
warranties of merchantability or fitness, or of any other obligations or liability
on the part of the Company.
The liability of the Company under this warranty is limited solely to repairing
or replacing its products during the warranty periods; and the final judgement
and disposition of all claims will be made by MEASUREMENT SYSTEMS
INTERNATIONAL, INC.
MADE IN THE
USA
©1998 by Measurement Systems International
Printed in U.S.A.
PUB.247-04-95B
14240 INTERURBAN AVENUE SOUTH
SEATTLE, WASHINGTON 98168-4660 U.S.A.
PHONE: 206-433-0199 • FAX: 206-244-8470
WEB: www.msiscales.com • E-mail: info@msiscales.com
Measurement Systems International
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