TELEDYNE
HASTINGS
INSTRUMENTS
INSTRUCTION MANUAL
DIGITAL VT
Manual Print History
The print history shown below lists the printing dates of all revisions and addenda created for this manual.
The revision level letter increases alphabetically as the manual undergoes subsequent updates. Addenda, which
are released between revisions, contain important change information that the user should incorporate
immediately into the manual. Addenda are numbered sequentially. When a new revision is created, all addenda
associated with the previous revision of the manual are incorporated into the new revision of the manual. Each
new revision includes a revised copy of this print history page.
Revision A (Document Number 162-012005).............................................................................. January2005
Revision B (Document Number 162-062005)................................................................................. June 2005
Revision C (Document Number 162-082005) .............................................................................August 2005
Revision D (Document Number 162-112005......................................................................... November 2005
Revision E (Document Number 162-092007)........................................................................September 2007
Revision F (Document Number 162-072009)................................................................................... July 2009
Visit www.teledyne-hi.com for WEEE disposal guidance.
CAUTION: The instruments described in this manual are designed for INDOOR use only.
CAUTION:
The instruments described in this manual are designed for Class 2 installations
in accordance with IPC standards
Hastings Instruments reserves the right to change or modify the design of its equipment without
any obligation to provide notification of change or intent to change.
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Table of Contents
1.
GENERAL INFORMATION............................................................................................................................................ 4
1.1
1.2
1.3
1.4
1.4.1
1.4.2
1.4.3
2.
INSTALLATION................................................................................................................................................................ 7
2.1
2.2
2.3
2.4
3.
FEATURES .................................................................................................................................................................... 4
SPECIFICATIONS ........................................................................................................................................................... 4
SAFETY ........................................................................................................................................................................ 5
ACCESSORIES ............................................................................................................................................................... 5
INSTALLATION ACCESSORIES....................................................................................................................................... 5
DV-6S: NEW DV-6 TUBE FOR SEVERE ENVIRONMENTS .............................................................................................. 5
CALIBRATION REFERENCE TUBES................................................................................................................................ 6
DIGITAL VT, OUTLINE DIMENSIONS .................................................................................................................. 7
DIGITAL VT, FRONT PANEL .................................................................................................................................. 7
DIGITAL VT, BACK PANEL.................................................................................................................................... 8
MOUNTING LAYOUT.............................................................................................................................................. 8
VACUUM GAUGE OPERATION ................................................................................................................................... 9
3.1
AC INPUT POWER ........................................................................................................................................................ 9
3.2
QUICK START............................................................................................................................................................... 9
3.3
PRESSURE MEASUREMENT ........................................................................................................................................... 9
3.4
OPERATION AND PERFORMANCE.................................................................................................................................. 9
3.5
GAUGE TUBE OPERATING PRINCIPLE......................................................................................................................... 10
3.6
CALIBRATION PROCEDURE ........................................................................................................................................ 10
3.6.1 PREPARATION .................................................................................................................................................................. 10
3.6.2 SET HIGH END ................................................................................................................................................................. 11
3.6.3 SET LOW END W/VACUUM SYSTEM................................................................................................................................ 11
3.6.4 SET LOW END W/REFERENCE TUBE................................................................................................................................ 11
4.
WARRANTY AND REPAIR .......................................................................................................................................... 12
4.1
4.2
WARRANTY REPAIR POLICY ...................................................................................................................................... 12
NON-WARRANTY REPAIR POLICY ............................................................................................................................. 12
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1. General Information
This manual contains technical and general information relating to the installation, operation, and
calibration of Hastings Vacuum Gauges, and Gauge Tubes.
For best performance, Hastings vacuum gauges should be operated with the appropriate Hastings gauge
tube. Attempting to use a Hastings vacuum gauge with other manufacturer’s tubes may result in damage to
both the gauge and tube.
1.1
Features
The Hastings Instrument’s Digital VT, is a digital readout version of the successful VT-Series “Hastings
Gauge” which has generated loyal customers for over 50 years. A reputation has been built on exceptional
stability, accuracy, and reliability under the most demanding conditions.
A precision A/D converter, with a microprocessor is used to measure the gauge tube’s signal output; it
converts the measurement to a pressure reading using the gauge tube’s well defined output/pressure function,
and then display the result.
The Digital VT Vacuum Gauge Meter is available for two Hastings Instruments most popular gauge tube
families: The DV-6 and DV-4. The DV-6 range is 0-1000 mTorr. The DV-4 range is 0-20 Torr. All VTSeries Vacuum Gauges feature long life and minimal maintenance.
These instruments utilize Hastings rugged noble metal TC gauge tubes that are designed specifically for
each range.
Tubes are matched and interchangeable without calibration adjustments. They are compensated for
temperature, rate of temperature change and are corrosion resistant.
1.2
Specifications
DIGITAL VT VACUUM METER:
INPUT POWER..................................................................................... 4.5-5.3 volts DC, 155 ma
.............................................W/ INCLUDED POWER CONVERTER 90-240 VAC, 47-63 HZ, 2 WATTS
CABLES (Approx.) ................................................ 6-ft. power cable and 8-ft. sensor cable included
WEIGHT (Approx.) .............................................................................................................1 lb
OPERATING TEMPERATURE RANGE .......................................................................... 5OC to 50OC
STANDARD METAL GAUGE TUBE (DV-6R, DV-4R):
OVERPRESSURE .................................................................................................... 50 psig max.
MATERIAL OF CONSTRUCTION ................................................. Nickel-Plated steel, Stainless Steel,
...........................................................................................Glass, Noble Metal, Thermocouples.
CONNECTIONS ......................................................................................1/8-in. NPT male thread
TUBE LEAK TEST ...................................................................................................... 10-8 SCCS
GLASS .............................................................. Available for high temperature bakeable systems
.................................................................................... 3/8 in. O. D. (10mm) smooth tabulation
VCR & KF CONNECTIONS ............................. VCR® female connection. 9/16-18 UNF, female threads
..............................................................w/0.75 hex, Cajon No. SS-4 VCR-3 and No. SS-4-VCR 1.
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CE Standard Compliance
1.3
Test
Standard
SAFETY
EN61010
EMC/EMI Family
EN61326
CONDUCTED/RADIATED
EN55011
ESD
EN61000-4-2
RF
EN61000-4-3
FAST TRANSIENTS
EN61000-4-4
SURGE
EN61000-4-5
CONDUCTED IMMUNITY
EN61000-4-6
VOLTAGE DIPS
EN61000-4-11
Safety
The following symbols and terms may be found on THI products and/or in THI manuals and indicate
important information.
When found on the device, this symbol indicates that the operator should refer to the manual for
important instructions on the proper use of this device. When found in a manual, this symbol
indicates that the reader should understand the implications contained in the text before operating the device.
The WARNING label indicates important information that should be heeded for safe and proper
performance of the device.
The label, CAUTION, is used to indicate that the damage to the power supply or equipment connected to
it, could occur if directions are not followed. Warranty could be invalidated if the instructions in this manual
are not followed.
1.4
Accessories
1.4.1 Installation Accessories
Hastings Instruments offers a complete line of system attachments that permit easy maintenance for
contaminated operations. Gauge tubes are offered with various system fittings to match almost any system
requirement. Additionally, Hastings’ complete line of quick disconnect attachments allows customers to install
these special fittings and easily replace sensors without vacuum sealant or Teflon® tape. For particularly dirty
systems, Hastings offers a particle dropout trap containing a series of nine separate baffles which prevent solid
contaminants from having a direct path to the sensor’s thermopile.
1.4.2 DV-6S: New DV-6 tube For Severe Environments
Hastings Instruments has developed a new gauge tube (DV-6S) which is specifically designed for outdoor
use on cryogenic tanks including railcar and tanker truck applications. In addition to the Digital VT, the gauge
tube is compatible with the hand-held HPM-4/6 and the analog VT-6.
The DV-6S is supplied with a protective cap. The o-ring-sealed cap protects the gauge tube pins from
moisture thus significantly reducing corrosion. A metal lanyard prevents cap loss. The tube is provided with a
standard 1/8” NPT fitting; however special fitting requests can often be met.
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1.4.3 Calibration Reference Tubes
Hastings Instruments Reference Tubes employ the same Hastings metal thermopiles used in all Hastings
Vacuum Gauge Tubes. The thermopile is sealed in a glass capsule that has been evacuated, baked, outgassed,
and then aged to ensure long-term stability. The sealed capsule is then housed in a protective metal shell to
provide a rugged, trouble-free assembly.
Once assembled, the reference gauge tube is accurately calibrated to precisely simulate a gauge tube at a
given operating pressure. It provides quick and easy instrument re-calibration by merely plugging the
instrument and adjusting the zero potentiometer until the display reads the exact pressure noted on the
reference tube.
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2. Installation
2.1
DIGITAL VT, OUTLINE DIMENSIONS
2.2
DIGITAL VT, FRONT PANEL
HASTINGS
VAC
ATM
Torr
mTorr
VT
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2.3
DIGITAL VT, BACK PANEL
2.4
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MOUNTING LAYOUT
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3. Vacuum Gauge Operation
All Hastings gauge tubes are shipped with a protective cap or cover at the evacuation port to reduce
contamination and prevent damage to the internal thermopile elements. Once the protective cap or cover is
removed, a tube can be installed in any convenient position in the vacuum system without adversely affecting
calibration or performance. The recommended orientation is with the tube vertical and its stem down. This
will aide in preventing condensable materials from remaining in the gauge tube.
3.1
AC Input Power
The Digital VT Power Supply input is rated as consuming 0.25 Amps @ 120VAC.
The Power/Gauge Tube Cable is assembled at the factory as shown in Fig. 4. It requires no further
wiring to be performed. To operate the Digital VT, plug the Power/Gauge Tube Cable into the
connector located in the rear of the Digital VT. Connect the plug of the power supply into a single phase 100230 VAC. 50/60 Hz power source
3.2
Quick Start
1. Plug Digital VT power supply into a 100-230 Hz outlet source.
2. Connect a DV4 or DV6 gauge tube to the Octal Socket cable assembly that is attached to the rear of
the Digital VT.
3. The CPU will do a self check/initialization. The digital display should count up and stop
momentarily at FFF. (Note: If the digital display shows a "- - -", this means the instrument is out of
range or gauge tube is unplugged.)
4. The Torr and mTorr LED’s should also momentarily illuminate.
5. After the CPU is operating, and the self check/initialization is complete, the display will indicate the output
of the DV4 or DV6 tube.
6. No other operator action is required.
7. For a more accurate reading from the DV4 or DV6 tubes, refer to Section 3.6 and perform a calibration of
unit.
3.3
Pressure Measurement
Connect the gauge tube cable’s octal socket onto the octal base of a gauge tube installed in vacuum system.
The gauge will display the system pressure on the Digital VT. To check the accuracy of the gauge, perform the
required operations as specified in section 3.3.
3.4
Operation and Performance
The Digital VT will function right “out of the box”. For maximum accuracy refer to section 3.6 and perform
the calibration procedure.
The simplest and quickest way of checking the operation and performance of a gauge and/or gauge tube, is
to keep in hand a new or known-good gauge tube on hand for use as a Reference.
To check operation, install both the Reference and suspect gauge tubes in a common vacuum system
(locate the gauge tubes as close as possible to each other), then evacuate the system until a stable base pressure
is obtained. Alternately connect the vacuum gauge to each gauge tube and record its pressure readings. If the
gauge tube-under-test produces a higher pressure reading than the Reference gauge tube, this indicates a
calibration shift and is usually the result of contamination (particulate, oil, or other chemical deposits). You
can try to restore calibration of the contaminated gauge tube by cleaning it internally with an appropriate
solvent such as high-purity isopropyl alcohol (flood the interior cavity of gauge tube gently with solvent and
162-072009 Digital VT
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allow it to stand and soak for about 15 to 30-minutes). Drain the contaminated solvent and let gauge tube dry
in ambient air until all of the cleaning solvent has evaporated. To prevent mechanical damage to the thermopile
elements, do not use forced air to dry the gauge tube. Gauge tubes that remain out of calibration after cleaning
should be replaced.
3.5
Gauge Tube Operating Principle
Operation of the Hastings gauge tube is based on a low voltage AC bridge that heats a noble metal thermopile.
A change in pressure in the gauge tube changes the molecular collision rate and therefore the thermal
conduction of the gas or gas mixture surrounding the thermopile. This results in a temperature shift in the AC
heated thermocouples A and B (Fig. 6). The resultant temperature shift causes a change in the DC output
from couples A and B inversely with pressure changes. The DC thermocouple C (when installed) is in series
with the circuit load. Thermocouple C provides compensation for transient changes in ambient temperature.
3.6
Calibration Procedure
NOTE: ONCE CALIBRATION IS COMPLETE THE CALIBRATION DATA IS PERMANENTLY
STORED IN NONVOLATILE MEMORY. A LOSS OF POWER WILL NOT ERASE THE
CALIBRATION DATA. TO ERASE THE CALIBRATION DATA, REFER TO STEP 2.
3.6.1 Preparation
1. Plug the Digital VT power supply into an outlet providing 100-230 VAC, 50/60 Hz.
2. CLEAR out any previously entered calibration data.
a. Using a pointed object, such as a ballpoint pen, press and hold the “ATM” push button located on
the front panel until “CLR” appears on the digital display. The “ATM” button must be held in the pressed
position approximately 5 seconds before data is cleared and “CLR” is displayed.
5. Once “CLR” is displayed any previously entered data has been deleted.
6. Plug in DV-4 or DV-6 gage tube. Leave tube at atmospheric pressure.
NOTE: TUBE MUST BE AT ATMOSPHERE TO PROPERLY SET THE HIGH END.
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3.6.2 Set High End
A. Press “ATM” push button until “Set” appears. The high-end setting is now set.
NOTE: The LOW END can be adjusted by either bringing the system to a known vacuum or by using a
HASTINGS REFERENCE TUBE.
3.6.3 Set Low End W/Vacuum System
A. Set system to known vacuum.
B. Turn the “VAC” pot on front panel until the known vacuum is displayed on digital display. (For DV-4
and/or DV-6 IF KNOWN VACUUM IS BELOW 1 mTorr SET DISPLAY TO ZERO).
C. The low end is now adjusted.
3.6.4 Set Low End W/Reference Tube.
A. Connect HASTINGS reference tube.
B. Turn the “VAC” pot until the value printed on HASTINGS reference tube is displayed on digital
Display.
C. THE LOW END is now adjusted.
NOTE: If re-calibration is required you must first repeat step 2.
IF SEVERAL TUBES ARE TO BE READ AND RE-CALIBRATION FOR EACH TUBE IS NOT
DESIRED, YOU MAY CLEAR THE CALIBRATION DATA (STEP 2) AND ONLY ADJUST THE
LOW END SETTING ONCE. HOWEVER A LOSS OF ACCURACY WILL BE NOTICED ON THE
HIGH END.
Note: The following table specifies the HASTINGS reference tube to be used in the calibration of a gauge
based upon the type of gauge tube being used.
162-072009 Digital VT
Ref. Tube
Gauge Tube
DB-16D
DB-18
DB-20
DV-4
DV-5
DV-6
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4. Warranty and Repair
4.1
Warranty Repair Policy
Hastings Instruments warrants this product for a period of one year from the date of shipment to be free
from defects in material and workmanship. This warranty does not apply to defects or failures resulting from
unauthorized modification, misuse or mishandling of the product. This warranty does not apply to batteries or
other expendable parts, nor to damage caused by leaking batteries or any similar occurrence. This warranty
does not apply to any instrument which has had a tamper seal removed or broken.
This warranty is in lieu of all other warranties, expressed or implied, including any implied warranty as to
fitness for a particular use. Hastings Instruments shall not be liable for any indirect or consequential damages.
Hastings Instruments, will, at its option, repair, replace or refund the selling price of the product if Hastings
Instruments determines, in good faith, that it is defective in materials or workmanship during the warranty
period. Defective instruments should be returned to Hastings Instruments, shipment prepaid, together with a
written statement of the problem and a Return Material Authorization (RMA) number. Please consult the
factory for your RMA number before returning any product for repair. Collect freight will not be accepted.
4.2
Non-Warranty Repair Policy
Any product returned for a non-warranty repair must be accompanied by a purchase order, RMA form
and a written description of the problem with the instrument. If the repair cost is higher, you will be contacted
for authorization before we proceed with any repairs. If you then choose not to have the product repaired, a
minimum will be charged to cover the processing and inspection. Please consult the factory for your RMA
number before returning any product repair.
TELEDYNE HASTINGS INSTRUMENTS
804 NEWCOMBE AVENUE
HAMPTON, VIRGINIA 23669 U.S.A.
ATTENTION: REPAIR DEPARTMENT
TELEPHONE
(757) 723-6531
1-800-950-2468
FAX
(757) 723-3925
E MAIL
mailto:hastings_instruments@teledyne.com
INTERNET ADDRESS
http://www.teledyne-hi.com/
Repair Forms may be obtained from the “Information Request” section of the Hastings Instruments web site.
162-072009 Digital VT
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