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DPG-6600 Instruction Booklet
The“Direct Drive Difference” in Digital
The 3D Digital Pressure Gauge DPG-6600 is an electronic
instrument designed for applications needing high
accuracy, excellent long-term stability, trouble-free
operation, high performance and long life. The
gauge is easy to use; it requires no external
electrical connections. It incorporates a large
0.75" four digit, 25 bar LCD display with a
four key sealed membrane switch.
The integral pressure transducer is a high
quality all stainless steel media-isolated sensor with no internal “O” rings, no silicone oil
and no welds. The gauge is intended for use in
the measurement of gases and liquids compatible
with stainless steel.
The accuracy of the gauge is +/- 0.25% of full scale
over a temperature of 0°C to 55°C (32°F to 131°F).
Full operating temperature range is -40°C to 85°C
(-40°F to 185°F).
The gauge is ideally suited to dynamic process and test applications with features such as
an adjustable software filter to stabilize readings where the pressure is fluctuating. The
pressure units are selectable and are displayed on the LCD. When a new unit is selected
the gauge automatically converts the reading to match the units. A configurable bargraph
gives the user a quick visual indication as to where the pressure is relative to low and
high values. A maximum high and maximum low pressure reading detection shows the
operator the pressure extremes that the process was exposed to. The gauge is powered
from an internal “C” size 3.6 volt replaceable lithium cell combined with the latest in microcontroller technology for extremely long continuous battery life. To extend battery life
even longer, a programmable power-on timer can be set from 0 to 720 minutes.
The enclosure is the standard 3D 4-1/2" ‘Dyna-Mount’ ABS case with a special swivel fitting and moveable flange. The gauge can be converted to front or back flange and bottom or back mount in the field with no more than a screwdriver. The digital pressure
gauge accepts all of the optional accessories offered in the mechanical gauge line including the metallic GP-140 chemical seal, elastomeric isolator GP-400 and the 316 SS sintered filter RS-380-1 for particulate laden process medias.
And finally, the DPG-6600 is manufactured and serviced by the company that makes
THE
Premier Pressure Gauge on the market today.
Get The Direct Drive Difference in
Digital Today!
INTRODUCTION
Page 2
The DPG-6600 series digital pressure
gauge is shipped with the internal battery
installed so that it is ready to use. Press
any key and the gauge will power-up. A
complete LCD segment test is performed
followed by the full scale reading of the
gauge in psi units. The gauge may be
adjusted to local atmospheric condition
using the ZERO/TARE function - see page
3. The full scale reading of the gauge in
psi units can be displayed at any time by
simultaneously pressing both arrow keys
L and M.
The DPG-6600 measures “gauge” pressure. “Gauge” pressure measures the
input pressure referenced to ambient
atmospheric pressure. The gauge will also
read vacuum down to absolute zero. The
vacuum readings will be displayed as
minus in the chosen unit of measure.
Mount the gauge to a suitable flat surface
using the flange and hardware supplied.
Avoid mounting the gauge with the LCD
display facing direct sunlight. The display
temperature range is -40°F to +185°F.
(-40°C to +85°C)
NOTE: Although flange mounting is suggested for high vibration applications, the
flange does not have to be used to mount
the gauge. Mounting the gauge using its
process connection to a pipe is acceptable
as long as excessive vibration is not experienced.
Attach the gauge to the pressure fitting
using teflon tape or equivalent. Tighten
the process connection by hand and continue to tighten 2 to 3 turns using a 9/16"
wrench on the stem of the gauge. Do not
use the gauge case to tighten pressure fitting.
WARNINGS AND CAUTIONS:
To ensure safe and accurate operation
please comply with the following warnings:
W
ARNINGS:
HAZARDOUS AREA OPERATION - The
DPG-6600 series gauge is CSA-certified
for CLASS I, DIVISION 1, GROUPS A, B,
C and D areas intrinsically safe.
SUBSTITUTION OF COMPONENTS MAY
IMPAIR INTRINSIC SAFETY. To prevent
ignition of a hazardous atmosphere, batteries must only be changed in an area
known to be nonhazardous.
SEVERE INJURY OR DAMAGE CAN
OCCUR THROUGH IMPROPER USE OF
PRESSURE INSTRUMENTS. Do not
exceed recommended pressure limits of
transducer, tubing and fittings. Be certain
all pressure connections are secured.
Deviation from these installation instructions may lead to improper operation of the
monitored machine which could cause personal injury to operators or other nearby
personnel.
CAUTION:
THIS GAUGE CAN DISPLAY ZERO
PRESSURE EVEN WITH UP TO 20% OF
FULL SCALE PRESSURE APPLIED. Do
not rely on the display indication when disconnecting pressure - it may not be indicating true pressure.
OPERATING INSTRUCTIONS
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ZERO / TARE
The zero function is used to “zero” the
gauge to compensate for any ambient
effects that cause an offset at zero pressure. The zero offset is limited to +/-2 psi
to +/-10 psi depending on the range of the
gauge. To “zero” the gauge, vent the pressure to the gauge to atmosphere (0 psig);
press the SETUP key, the gauge will read
“ZERO”, press ENTER and the gauge will
be zeroed at the current pressure value.
The tare function can be used to offset the
zero point of the gauge to any vacuum or
positive gauge pressure from 0 to 20% of
full range of the gauge. Both the under
and over arrows will blink to indicate when
tare is used. To access the tare function,
press the SETUP key until the display
reads “tare”, press ENTER and the gauge
will be zeroed at the current pressure
value. The tare offset can be canceled at
any time by pressing SETUP and then the
up or down arrow key then ENTER. The
zero offset will return to the original zero
reading. Note that offsetting the zero
using the tare function can limit the range
of the gauge. Using a 0-100 psi gauge as
an example, if the tare function is exercised at 20 psi reading, the maximum
pressure that can be displayed will be
110% of actual full scale (110 psi minus 20
psi offset = 90 psi displayed).
CAUTION: Before disconnecting the
gauge from its pressure source make sure
that the pressure is at zero psi by canceling the tare function as described above.
OVER-PRESSURE CONDITIONS
The DPG-6600 series gauge has a displayed range of -14.5 psig (or equivalent)
to 110% of gauge range. If these limits are
exceeded, the low or high out of range
arrows will be displayed and the reading
will remain at the limit indicated above.
NOTE: If tare was used to offset zero, the
max reading will be offset by the zero offset amount. For an explanation, see
ZERO / TARE section above.
IMPORTANT: The internal pressure transducer in the gauge will withstand a maximum of 2 times the rated pressure without
damage. Burst pressure is 5 times or
25,000 psi, whichever is less. If the overload rating is exceeded, failure may occur.
Pressure fluctuations may not be displayed, especially if the filter value is set
for high dampening. Pressure fluctuations
occur in most systems; select the gauge
range with a rating high enough to prevent
overload by peak pressures of pulsations.
It is recommended that a pressure snubber
be used which will reduce the peak pressure applied to the gauge. The life of the
gauge will be extended with the use of a
snubber or pulsation dampener.
SELECTING UNITS
A number of pressure units are available
with the DPG-6600 series gauge; the most
common ones are displayed on the LCD.
To select a different unit press the SETUP
key until the display reads “Unit”, use the L
or M (up or down) arrow key to scroll
through the displayed available units, select
a unit and press ENTER. To configure the
gauge for pressure units that are not on the
display, select “SPEC” (special) and press
ENTER. Using the flowchart on page 8 as
a guide, configure the decimal point location and the low and high values. The low
value will be the pressure value in the chosen units equivalent to -14.5 psig, and the
high value will be the pressure value in the
chosen units at 110% of gauge range. The
zero and tare offsets are not adjustable
when using the “special” configuration.
MEASURING V
ACUUM
All ranges of the DPG-6600 can measure
vacuum down to -14.5 psig or equivalent in
another unit of measure. When measuring
a pressure less than ambient barometric
conditions, a minus (-) sign will be
displayed.
OPERATING INSTRUCTIONS
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If the input goes below -14.5 psig, the display will read -14.5 (or equivalent) and the
lower out of range arrow will be displayed.
Accuracy of the vacuum readings are
dependant on the span of the gauge –
consult the Accuracy section on Page 10
for details.
ADJUSTING THE DISPLA
Y
FILTER
The display filter can be used to stabilize
the display reading of a pulsating pressure
input. The filter value is read-out from 1 to
255; 1 being minimum filter value, 255
being maximum filter value. Below are
some typical filter values and their effect
on the display reading. Settling values are
approximate times in seconds to reach
90% of new reading. To set the filter value
press the SETUP key until the display
reads "FILt". Press the ENTER key and
the display will read the previously set filter
value. Use the L or M arrow key to
increase or decrease the filter value and
press ENTER to save the new filter value.
FILTER VALUE 1 64 96 128
SETTLING, SEC. 1 2 3 4
FILTER VALUE 160 200 210 220
SETTLING, SEC. 6 10 12 16
FILTER VALUE 230 240 245 250
SETTLING, SEC. 21 36 60 96
LO / HI DETECTION
The DPG-6600 continuously records the
lowest and highest filtered pressure
applied to the gauge. To view the low and
high values, press the SETUP key until the
display reads “LO.HI” and press ENTER.
The display will read the minimum low
value recorded. Press ENTER to read the
maximum high value recorded. The lower
half of the bargraph will display to indicate
the reading is the max low value and the
upper half of the bargraph will display to
indicate the reading is the max high value.
These readings will remain stored if the
gauge is powered down.
RESETTING RECORDED LO / HI
VALUES
To clear the current values, display either
the low or high value and press either the
L or M arrow key; the display will show
“Clrd” and the values will begin new low
and high values.
CONFIGURING THE BARGRAPH
The bargraph shows the gauge pressure in
a graph form between two points. The
bargraph can be configured to display
pressure in different modes. To reach the
bargraph menu, press the SETUP key until
the display reads “bAr”, the previous configuration will be displayed. To change the
type of bargraph, press either the L or M
arrow key to scroll between the different
configurations. Upon selecting the desired
bargraph type, press ENTER to save.
"On IIIIII" Bar mode between the
two max points. When this mode is
selected the low point will be 0 psig or
equivalent and the bars will increase to
100% of range.
"On I I I" Single bar between
the two max points. When this mode is
selected the low point will be 0 psig or
equivalent and a single bar will increase
to 100% of range.
"On.HL IIIIII" Bar mode between
two selected points. When this mode is
selected press ENTER and adjust the
low point to the desired value. Press
ENTER and adjust the high point. The
bars will increase from the low point to
the high point.
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"On.HL I I I" Single bar between
two selected points. When this mode is
selected press ENTER and adjust the
low point to the desired value. Press
ENTER and adjust the high point. A single bar will increase from the low point
to the high point.
"OFF" No bargraph displayed.
When selected the bargraph will be off.
POWER ON TIMER
When received, the power on timer is set
to 60 minutes. The gauge will turn on with
any key press and will remain on for 60
minutes without a key press. The power
on timer, can be set anywhere between 1
and 720 minutes (12 hours). If “0" is
entered, the gauge will remain on continuously. To change the timer, press the
SETUP key until the display reads “POt”,
press the ENTER key and the current
timer value will be displayed. Press the L
or M arrow key to increase or decrease
the on time; press ENTER to save.
BA
TTERY - LOW INDICATION AND
REPLACEMENT
The gauge is designed to give many years
of service life with the supplied, high energy density, extra long life lithium battery.
When the battery needs replacement, the
display will alternate between the pressure
reading and “L.BAt”. At this time the
gauge will continue to work properly.
When the “L.BAt” indication displays continuously, the battery is exhausted and
must be replaced. Use 1 “C” size 3.6 volt
high energy lithium battery, Tadiran models
TL-5920 or TL-2200 or Saft model
LS26500 or equivalent. See page 12 for
battery replacement instructions.
NOTE: DO NOT use a 1.5 volt “C” size
battery. Such use will void the warranty.
OPERATING INSTRUCTIONS OPERATING INSTRUCTIONS
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SPAN ADJUSTMENT ONLY - To make a
small adjustment on the span point of the
gauge, enter the calibration mode, the display reads "CAL", press ENTER; the display will read "CAL.L". Press the SETUP
key and the display will read "CAL.H" for
the high or span calibration value. With
the standard at the desired span value
press ENTER and after the “bar” timer
expires use the L or M arrow key to
increase or decrease the display reading
to match the standard and press ENTER.
The display will read "SA
VE/donE" and will
return to the normal reading with the new
span calibration value stored in permanent
memory.
SELECTING THE DEFAULT CALIBRATION - The user can at any time during the
life of the gauge return to the factory calibration values. Press and hold the L
arrow key and press the SETUP key until
the display reads "CAL", now press the
SETUP key until the gauge reads “dFLt”.
Press ENTER and the factory calibration
values will be recalled and used for the
calibration of the gauge.
For the 4
1
⁄2" black ABS plastic case config-
uration, the product part number for the
various pressure ranges are as follows:
66544-xxB71
Pressure Range Code (xx)
50 psig 18
100 psig 23
200 psig 25
500 psig 27
1000 psig 29
2500 psig 47
5000 psig 35
10,000 psig 38
300 Series SS case available. Consult 3D
Instruments for details.
If adjustment is required, we recommend
returning the gauge to the factory.
Factory service offers many benefits. We
have the facilities to provide calibration
reports that include test data at a variety of
temperatures utilizing NIST traceable standards. In addition, upgrades may be available to add or enhance operating features.
We designed the product to last, and we
support it so that you can get the most
from your investment.
Although we prefer that you return the
DPG-6600 to 3D instruments for calibration, ordinary adjustments may be performed by a qualified person with appropriate equipment.
The calibration standard used should have
an accuracy of 0.05% of full scale or better.
NOTE: Be sure that the units of the calibrator match the units of the gauge before
performing a calibration.
Calibration may be performed many times
over the life of the gauge. Calibration can
be performed from the front keypad without
disassembling the gauge. To calibrate the
gauge, use a dead weight tester or the 3D
Star Calibrator as the calibration standard.
NOTE: During calibration, the gauge
allows 2 minutes between keystrokes to
change or save a new calibration. If 2
minutes lapse without a keystroke, the
gauge will automatically return to the normal mode without making any changes.
The new calibration information is saved
only if the ENTER key is pressed and the
gauge reads "SAVE/donE".
CALIBRATION PROCEDURE - To calibrate the gauge, press and hold the L
arrow key and press the SETUP key until
the display reads "CAL", press ENTER; the
display will read "CAL.L" for the low or
zero calibration value. Adjust the standard
for a reading at zero and press ENTER.
After the “bar” timer expires, use the L or
M arrow key to increase or decrease the
display reading to match the reading of the
standard and press ENTER; the display
will read "CAL.H" for the high or span calibration value. Adjust the standard for a
reading at or near full scale and press
ENTER. After the bar timer expires, use
the L or M arrow key to increase or
decrease the display reading to match the
standard and press ENTER. The display
will read "SAVE/donE" and return to the
normal reading with the new calibration
values stored in permanent memory.
The DPG-6600 gauge has a feature that
allows a slight adjustment of either the
zero or span values individually. This type
of calibration can be used to "tweak" the
readout to match that of a known value
without actually performing a formal calibration procedure.
NOTE: This type of adjustment will invalidate calibration settings resulting from the
procedures in the above section.
ZERO ADJUSTMENT ONLY - To make a
small adjustment on the zero calibration
value of the gauge, enter the calibration
mode, the display reads "CAL", press
ENTER; the display will read "CAL.L" for
the low or zero calibration value. Adjust
the standard for a reading at zero and
press ENTER. After the “bar” timer
expires, use the L or M arrow key to
increase or decrease the display reading
to match the reading of the standard and
press ENTER. The display will read
"CAL.H"; press the SETUP key and the
display will read "SAVE/donE" and will
return to the normal reading with the new
zero calibration value stored in permanent
memory.
CALIBRATION CALIBRATION
DPG-6600 PART NUMBERING SYSTEM
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End End
FLOWCHART DPG-6600
BATTERY POWERED
DIGITAL GAUGE
NORMAL NORMALZErO tArE
SETUP SETUP SETUP SETUP
ENTER ENTER
UnIt FILt
ENTER
POWER ON TIMER
SETUP SETUP SETUP SETUP
LO.HI bAr
ENTER
ENTER
POt
ENTER ENTER ENTER
HOLD
THEN SETUP
CAL
SETUP
dFLt
SETUP
SAVE/
donE
End
ENTER
UnIt
psl
H2O
Hg
Kg/cm2
mmHg
mmH2O
bar
mbar
SPEC
SPEC
ENTER
ENTER
ENTER
ENTER
dPnt
XXXX
XXXX
ENTER
ADJUST
LOW
POINT
ADJUST
HI
POINT
1-255
XXXX
ENTER
XXXX
ENTER
0.0
OR
CLrd
CLrD
OR
OR
ENTER
On
On
On.HL
On.HL
On.HL
OFF
On.HL
ENTER
ENTER
ENTER
XXXX
XXXX
0-720
MIN.
ENTER
ADJUST
LOW
POINT
ADJUST
HI
POINT
FLOWCHART
KEY
NO CHANGE L < H
DOUBLE BARS-
psi
XXXX
ANDPRESS BOTH TOGETHER TO DISPLAY THE FULL SCALE READING OF THE GAUGE.
USE UP AND
DOWN ARROW
KEYS TO SCROLL
SETUP
CAL.L
ENTER
XXXX
ENTER
SETUP
CAL.H
ENTER
XXXX
ENTER
L > H
psi
H2O
Hg
Kg/cm2
mmHg
mmH2O
bar
mbar
SPEC
TEST
CAL
DASHED
LINESMAKE
SELECTION
Err
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PRESSURE CONVERSIONS
1 psi = 27.6806 inches of water column
(water at 4°C [39.2°F])
1 psi = 2.03602 inches of mercury
(mercury at 0°C [32°F])
1 psi = 6.8948 kilopascals
1 psi = 51.7149 millimeters of mercury
(mercury at 0°C [32°F])
1 psi = 703.087 millimeters of water
column (water at 4°C [39.2°F])
1 psi = 0.068948 bar
1 psi = 68.948 millibar
1 psi = 0.070307 kilograms per square
centimeter
OPTIONS &
ACCESSORIES
NIST Certificate of Conformance
(standard)
OPTIONS & ACCESSORIES (Con’t)
GCO1: Calibration Certificate Level #1 - 10
readings done in descending pressure at
room temperature
GCO2: Calibration Certificate Level #2 - 13
readings in both ascending and descending pressures at room temperature
GCO3: Calibration Certificate Level #3 - 13
readings in both ascending and descending pressures done at three distinct temperatures...typically: 22°C, 5°C and 45°C.
P/N 8110-300 (Pneumatic Handpump: 0 to
300 psi)
P/N 8111-300 (Duplex Handpump: -13.7 to
300 psi)
P/N 8112-3000 (Hydraulic Handpump: 0 to
3000 psi)
P/N RS380-1 (Stainless Steel Filter)
P/N GP140KT-B/X (Metallic Diaphragm
Seal)
GP1007 Sanitary 1 1/2" Ladish Tri-clamp
GP1002 Sanitary 2" Ladish Tri-clamp
P/N 2230-0003 3.6 VDC Lithium Cell
ACCURACIES
0 to Full Scale +/- 0.25% of Full Scale
Vacuum 0 -100 psig and below:
+/- .3 psig; 200 1000 psig: +/- 1 psig;
2500 psig and above:
unrated.
NOTE: Accuracy specs are for one year
and include all effects of linearity, hysteresis, repeatability and temperature, within
the specified temperature compensated
range.
Exposure to environmental extremes of
temperature, shock or vibration may warrant a more frequent re-certification period.
MEDIA
COMPATIBILITY
Liquids and gases compatible with 316
Stainless Steel.
POWER
Battery 1 each 3.6 volt lithium “C”
cell, Tadiran model TL-5920
(8.5 Ah), Tadiran model
TL-2200 (7.2 Ah) or Saft
model LS26500 (7.3 Ah)
or equivalent.
NOTE: Do NOT use a 1.5
volt “C” size battery.
Battery Life 5 years of continuous
operation.
Low Battery Two indicators Indicator 1st: alternating reading of
pressure and L.BAt
2nd: a continuous reading of
L.BAt
DISPLA
Y
UPDATE RATE
1 update per second nominal
PRESSURE FITTING
1/4" male NPT – 316SS
ENCLOSURE
Case ABS or optional
300 Series SS
Hardware Stainless Steel
Dimensions Refer to Page 13
Weight 514 g (18oz)
including battery
TEMPERA
TURE
Temperature Compensated Range:
0°C to 55°C (32°F to 131°F)
Overall Operating Range:
-40°C to 85°C (-40°F to 185°F)
Storage Range:
-40°C to 85°C (-40°F to 185°F)
HUMIDITY
Temperature Range Humidity
0 to 10°C Uncontrolled
10 to 30°C 0 to 95° Relative
30 to 40°C 0 to 75° Relative
40 to 50°C 0 to 45° Relative
REPLACEMENT P
ARTS
User replaceable battery - see Page 12.
PRESSURE RANGE/DISPLAY RESOLUTION CHART
Available Pressure Ranges & Display Resolution
Pressure Max Over Display Resolution
Range Pressure Available Units
psig psig psig In In mm mm bar mbar Kg/cm2
H2O Hg H2O Hg
-14.5 – 50 100 0.1 1 0.1 1 1 0.001 1 0.001
-14.5 – 100 200 0.1 1 0.1 1 1 0.01 1 0.01
-14.5 – 200 400 0.1 1 1 1 1 0.01 1 0.01
-14 – 500 1,000 1 1 1 — 1 0.01 1 0.01
-14 – 1,000 2,000 1 1 1 — 1 0.1 1 0.1
0 – 2,500 5,000 1 — 1 — — 0.1 — 0.1
0 – 5,000 10,000 1 — 1 — — 0.1 — 0.1
0 – 10,000 20,000 1 — 1 — — 1 — 1
Notes:
1. Measured pressure range is -14.5 to 110% of Full Scale for pressure ranges 200 psi
and below and -14 to 110% of Full Scale for pressure ranges from 200-1000 psi.
2. Burst pressure is 5X or 25,000 psi, whichever is less.
3. Display maximum is 9999 regardless of engineering unit.
SPECIFICATIONS SPECIFICATIONS
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BATTERY REPLACEMENT
Use 1 “C” size 3.6 volt high energy lithium battery, Tadiran models TL-5920 or
TL-2200 or Saft model LS26500 or equivalent.
NOTE: DO NOT use a 1.5 volt “C” size battery.
1. Remove the four access screws on the back of the gauge as shown.
2. Remove snap ring from the front of the gauge.
3. Carefully separate the front of the gauge from the back housing.
4. Install battery as indicated on battery holder.
DIMENSIONAL DRAWING
WARNING: TO PREVENT IGNITION OF A HAZARDOUS ATMOSPHERE,
BATTERIES MUST ONLY BE CHANGED IN AN AREA KNOWN TO BE
NONHAZARDOUS.
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WARRANTY
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eb Site
http://www.3dinstruments.com
The“Direct Drive Difference” in Digital
3D Instruments, LP warrants the DPG-6600 to be free from defects in material and workmanship under normal use and service for one (1) year from date of purchase to the original purchaser. It does not apply to batteries or when the product has been misused,
altered or damaged by accident or abnormal conditions of operation.
Within one (1) year from date of purchase, 3D Instruments will, at our option, repair or
replace a defective device free of charge and the device will be returned, transportation
prepaid. However, if we determine the failure was caused by misuse, alteration, accident
or abnormal condition of operation, you will be billed for the repair.
3D INSTRUMENTS, LP MAKES NO WARRANTY OTHER THAN THE LIMITED WARRANTY STATED ABOVE. ALL WARRANTIES, INCLUDING IMPLIED WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE, ARE LIMITED TO A PERIOD OF ONE (1) YEAR FROM THE DATE OF PURCHASE. 3D INSTRUMENTS, LLC SHALL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT, TORT OR OTHERWISE.
For warranty or non-warranty service, we can be reached at:
Phone........................714•399•9200
Email .........................info@3dinstruments.com
©2013 3D Instruments, LP
2900 E. White Star Avenue
Anaheim, CA 92806
Ph: 714•399•9200
E-mail: info@3dinstruments.com
W
Address .....................3D Instruments, LP
Attn: Accu-Cal Plus Service Department
2900 E. White Star Avenue
Anaheim, CA 92806
U.S.A.
Web...........................www.3dinstruments.com
Return Authorization is not required for servicing. Please return, Freight Prepaid, to the
address above and include a Contact Name, Address, Phone and Fax Number. If you
wish to be notified of the charges before any service is done, 3D Instruments will contact
you after evaluating the unit. Units evaluated but not serviced are subject to an evaluation charge. Defective units need to be returned to 3D Instruments, LP within 90 days of
identification of a problem.
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