Hastings VT User manual
101B - PAGE 1
TELEDYNE BROWN ENGINEERING
HASTINGS INSTRUMENTS
P.O.BOX 1436
HAMPTON, VIRGINIA 23661 U.S.A.
TELEPHONE (804)723-6531
FAX (804)723-3925
© May 1995
HASTINGS COMPACT
VACUUM CONTROLLERS
VT MODELS
101B - PAGE 2
101B - PAGE 3
TABLE OF CONTENTS
SECTION 1.0 GENERAL INFORMATION ........................................................................................... 5
1.1 Description ........................................................................................................................................ 5
1.2 Operating Principle............................................................................................................................ 5
1.3 Specifications ................................................................................................................................... 5
1.4 Warranty ........................................................................................................................................... 6
1.5 Accessories ...................................................................................................................................... 6
1.6 Selection Chart ................................................................................................................................. 6
SECTION 2.0 GAUGE TUBES AND CABLES ....................................................................................... 8
2.1 Gauge Tubes............................................................................................................................... 8
2.2 Extension Cables ........................................................................................................................ 8
SECTION 3.0 INSTALLATION PROCEDURE ....................................................................................... 10
3.1 Panel Mounting ........................................................................................................................... 10
3.2 Cabinet Models ........................................................................................................................... 10
3.3 Power Switch .............................................................................................................................. 10
3.4 Hastings MultiPosition Switching Capabilities ............................................................................. 10
3.4.1 Multiposition Switching Attachment ......................................................................................... 10
3.4.2 Cabinet Models with Switching................................................................................................. 10
3.5 Gauge Tube Installation .............................................................................................................. 10
SECTION 4.0 OPERATION OF VACUUM GAUGE ................................................................................. 11
SECTION 5.0 CALIBRATION AND TROUBLESHOOTING GUIDE ............................................................ 12
5.1 Check of Tube Accuracy............................................................................................................. 12
5.2 Calibration Procedure for CVT Models 14, 24, 16 and 26............................................................ 12
5.2.1 Calibration of all Models except VT-4A,VT-5A,VT-5AB,VT-5AS2,VT-5AS & VT-6A ................. 12
5.2.2 Calibration of Models VT-4A, VT-5A, VT-5AB, VT-5AS2, VT-5AS & VT-6A ............................. 12
101B - PAGE 4
SECTION 6.0 NOTES ON VACUUM MEASUREMENTS ........................................................................ 14
6.1 Effects of Condensable Vapors ................................................................................................... 14
6.2 Outgassing .................................................................................................................................. 14
6.3 Ingassing..................................................................................................................................... 14
6.4 Effect of Thermal Conductivity.................................................................................................... 14
6.5 Effects of System Conductance ................................................................................................. 14
SECTION 7.0 SERVICE INFORMATION ............................................................................................... 15
7.1 Warranty Repair Policy................................................................................................................ 15
7.2 Non-Warranty Repair Policy ........................................................................................................ 15
7.3 Service Form............................................................................................................................... 17
SECTION 8.0 DRAWINGS AND DIAGRAMS ......................................................................................... 19
8.1 DV-5 Gauge Tube Nomogram .................................................................................................... 20
8.2 DV-6 Gauge Tube Nomogram .................................................................................................... 21
8.3 DV-4D Gauge Tube Nomogram .................................................................................................. 22
8.4 DV-5 & DV-18 Gauge Tubes Nomogram .................................................................................... 23
8.5 DV-6M, DV-6R, DV-20 & DV-36 Gauge Tubes Nomogram ......................................................... 24
8.6 Sulfur Hexaflouride Nomogram................................................................................................... 25
8.7 VT-4B & VT-6B Schematic......................................................................................................... 26
8.8 VT-4S & VT-6S Schematic......................................................................................................... 27
8.9 VT-4 & VT-6 Schematic ............................................................................................................. 28
8.10 VT-4A, VT-5A & VT-6A Schematic .............................................................................................29
8.11 VT-4S2 & VT-6S2 Schematic ..................................................................................................... 30
8.12 VT Outline Dimensions............................................................................................................... 31
8.13 Mounting Dimensions for Units with 503 Meters and VL-2 or VL-5 Switching Attachments ....... 32
8.14 VT Mounting Dimensions (Model VT Vacuum Gauge only) ........................................................ 33
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.
101B - PAGE 5
1.0 GENERAL INFORMATION
This manual contains technical and general information concerning the installation, operation and calibration of Hastings
Compact Vacuum Gauges, VT-Models, and associated components.
For proper operation, Hastings Compact Vacuum Gauges must be suitably connected to a Hastings companion Gauge Tube.
Attempting to use this Vacuum Gauge with any other transducer may damage both the gauge and other transducer.
1.1 Description:
Hastings Compact Vacuum Gauges are self-contained instruments that offer extreme versatility for all vacuum applications. The
electronic design assures long life and minimal maintenance. Compact models are ready for mounting onto a panel. Cabinet
models are also available with or without switching attachments that can monitor 2 or up to 5 stations. The letter "A" in the
model number (i.e. Model VT-5A) designates 0-1 VDC analog output. See SELECTION CHART, page 3, for complete descriptions
and model numbers.
These instruments utilize Hastings rugged but sensitive gauge tubes which are designed specifically for each of the three
available ranges. Tubes are also compensated for temperature and rate of change of temperature.
1.2 Operating Principle:
Operation of the Hastings Vacuum Gauge
is based on a patented low voltage AC
bridge which heats a noble metal
thermopile circuit (Figure 1.1). A change
in pressure in the tube creates a change
in the thermal conductivity of the gas
cooling the thermopile, which in turn
causes a temperature shift of AC
thermocouples A and B. This causes the
DC output from the two thermocouples to
change with pressure.
The DC thermocouple, C, is unheated and
in series with the indicating meter circuit. Ambient temperature variations will develop voltages in all thermocouples; however,
the transient effects in heated and unheated elements are equal and opposite, therefore the unheated couple compensates for
transient temperature changes.
1.3 Specifications:
Range, all VT-4 Models................................................................................ 0-20 millimeters of mercury or 0-20 millibars
Range, all VT-5A Models................................................................................ 0-100 microns of mercury or 0-0.1 millibars
Range, all VT-6 Models....................................................................................... 0-1000 microns mercury or 0-1 millibars
Power .................................................................................................................... 115 VAC, 50/60 hz; 230 VAC optional
Output ....................................................................... VT-4A,VT-5A,&VT-6A Models, 0-1V @ 4 mA (1V @ Hard Vacuum)
Size........................................................................................................................................ See Dimensions, page 21
Cables ...................................................................... 6-foot power cable and 8-foot gauge tube cable (lengths are approx)
Weight ................................................................................................ Approx. 1-1/2 lb., including gauge tube and cable
FIG 1.1
101B - PAGE 6
1.4 Warranty:
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 failure resulting from unauthorized modification, misuse, or mishandling
of the product. This warranty does not apply to fuses, filters, batteries, or other expendable parts, nor to damage
caused by leaking batteries, clogged filters, or similar occurrences.
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. Refer to
Section 7.0 for warranty or other services for this product.
1.5 Accessories:
MULTIPOSITION SWITCHING ATTACHMENTS: For mounting behind panel adjacent to meter. Includes pilot
light, ON-OFF switch, selector switch and 8-foot cable.
(NOTE: Switching attachments are not for use with VT-5A Models.)
Model VL-2: Two-position
Model VL-5: Five-position
KIT 1: Mounting kit for desk or bench use. Includes stand and ON-OFF switch.
KIT 2: Mounting kit for panel or cabinet installation. Includes pilot light and ON-OFF switch.
EXTENSION CABLES: Available in 8-ft., 12-ft., 25-ft., 50-ft., and 100-ft. lengths.
GAUGE TUBE INSTALLATION ACCESSORIES: Quick connects, dropout traps, adapters, and valved quick
connects.
1.6 Selection Chart:
On the following page is a chart showing all VT Vacuum Gauge models, ranges, and compatible gauge tubes.
101B - PAGE 7
COMPACT VACUUM GAUGES
STOCK# MODEL# VACUUM GAUGE RANGE
55-149 VT-4 Compact Model 0-20mm Hg
0-20 mbar
55-150 VT-4B Cabinet Model 0-20mm Hg
0-20 mbar
55-151 VT-4S2 Cabinet Model, 2-Position 0-20mm Hg
0-20 mbar
55-152 VT-4S* Cabinet Model, 5-Position 0-20mm Hg
0-20 mbar
55-129 VT-4A Compact Model, 1VDC 0-20mm Hg
0-20 mbar
55-119 VT-5A Compact Model, 1VDC 0-100µHg
0-.1 mbar
55-109 VT-5AB Cabinet Model, 1VDC 0-100µHg
0-.1 mbar
55-153 VT-6 Compact Model 0-1000µHg
0-1 mbar
55-154 VT-6B Cabinet Model 0-1000µHg
0-1 mbar
55-155 VT-6S2 Cabinet Model, 2-Position 0-1000µHg
0-1 mbar
55-156 VT-6S* Cabinet Model, 5-Position 0-1000µHg
0-1 mbar
55-215 VT-6A Compact Model, 1VDC 0-1000µHgr
0-1 mbar
GAUGE TUBES
STOCK# MODEL# GAUGE TUBE
55-19 DV-4D Std. Metal (purple base)
55-19R DV-4R Ruggedized
55-69 DV-34 Stainless Steel
55-227 DV-4D-VCR Metal w/VCR connector
55-258 DV-4D-KF-16 Metal w/KF-16 connector
55-266 DV-4D-KF-25 Metal w/KF-25 connector
67-6 DV-5M Std. Metal (red base)
55-230 DV-5M-VCR Metal w/VCR connector
55-38 DV-6M Std. Metal (yellow base)
55-139 DV-20 Glass
55-38R DV-6R Ruggedized
55-66 DV-36 Stainless Steel
55-229 DV-6M-VCR Metal w/VCR connector
55-251 DV-6M-KF-16 Metal w/KF-16 connector
55-267 DV-6M-KF-25 Metal w/KF-25 connector
* Starred items require one gauge tube and one cable for each position to be used. Standard metal tubes have
1/8" NPT male thread connection. Glass tubes have 10mm (3/8") OD tubulation.
Stainless tubes require adapter cable type OM-1-MSF.
NOTE: 220 VAC is available as an option. All 220 VAC models have millibar scales. Add prefix "E" to the model
number. EX. Model VT-5A with 220 VAC option becomes Model EVT-5A.
101B - PAGE 8
2.0 GAUGE TUBE AND CABLES
The tube types for each model of the Hastings Compact Vacuum Gauge are listed in Section 1.6 (Selection Chart). Gauge Tube
Installation is described in Section 3.5.
2.1 Gauge Tubes:
Hastings Vacuum Gauge Tubes (with external circuit) form a low voltage AC bridge noble metal thermopile circuit. A change in
pressure in the tube creates a change in thermal conductivity of the gas cooling the thermopile. This causes a change in the
DC output from the thermocouples.
The tubes are to be installed in a 1/8" NPT female thread, or in a Hastings Type OS Quick Connector.
The octal sockets of standard metal tubes are color-coded for easy identification: The DV-4D is purple, the DV-5M is red, and
the DV-6M is yellow.
In addition to standard metal gauge tubes, there is a choice of:
GLASS - Available for high temperature and bakeable systems. 10mm (3/8") O.D. smooth tubulation
RUGGEDIZED - Nickel-plated hermetically sealed base w/monel housing for weather resistance.
STAINLESS STEEL - For weather-proof, corrosive, and bakeable applications. Withstands high overpressurization. Plain or
threaded connection. (requires OM-1-MSF adaptor cable)
VCR CONNECTION - VCR female nut connection. 9/16-18 UNF, female threads w/.75 hex, Cajon #SS-4-VCR-3 and #SS-4-
VCR-1.
ISO-KF CONNECTION - KF-16 or KF-25 with all stainless steel construction (request Product Bulletin #337).
2.2 Extension Cables:
Hastings extension cables are
available in 8, 12, 25, 50, and
100 foot lengths. These cables
are #18 gauge, 3-conductor
cables. The three color-coded
wires (Black, White, Green) are
connected as shown in Figure
2.1.
Each instrument is shipped with
a 6-foot power cable and an 8-
foot gauge tube cable. Exten-
sion gauge tube cables are
available, as shown in the table
on page 5.
Extension gauge tube cables for all VT Models except VT-4S, VT-5AS, and VT-6S:
STOCK # MODEL # DESCRIPTION
55-3 OM-8-OFV 8-foot extension cable
55-22 OM-12-OFV 12-foot extension cable
65-53 OM-25-OFV 25-foot extension cable
65-102 OM-50-OFV 50-foot extension cable
55-142 OM-100-OFV 100-foot extension cable
FIG 2.1
101B - PAGE 9
Extension gauge tube cables for VT-4S, VT-5AS, and VT-6S:
STOCK # MODEL # DESCRIPTION
55-5 CF-8-OFV 8-foot extension cable
65-37 CF-12-OFV 12-foot extension cable
55-23 CF-25-OFV 25-foot extension cable
55-47 CF-50-OFV 50-foot extension cable
65-47 CF-100-OFV 100-foot extension cable
101B - PAGE 10
3.0 INSTALLATION
3.1 Panel Mounting:
An outline drawing detailing panel cut-out dimensions is provided on page 29. Install the meter on the panel using the
supplied hardware.
3.2 Cabinet Models:
Cabinet models (VT-4B, VT-4S2, VT-4S, VT-5AB, VT-6B, VT-6S2, VT-6S) require only installation of gauge tube and
cable as described in the following sections. However, the cover must be removed to perform any necessary
calibration adjustments.
3.3 Power Switch:
If an ON-OFF switch is desired, a switch may be wired into the power cable to provide this function. If both "hot" leads are to
be broken, a double pole single throw switch should be utilized. The power cable may also be cut and wired into any master
switch or circuit breaker on a panel.
CAUTION: If cutting cables, DO NOT interchange power and gauge tube cables.
3.4 Hastings Multiposition Switching Capabilities:
3.4.1 Multiposition Switching Attachment
If a Hastings Panel Kit is utilized, an ON-OFF single pole switch, pilot light, and 8-foot cables are included with a 2 or
5 position (Model VL-2 or VL-5) selector switch which can monitor 2 or up to 5 stations.
3.4.2 Cabinet Models With Switching
Cabinet model vacuum gauges can be obtained with built-in switching arrangements that operate in the same
manner as the multiposition switching attachment. Models include the VT-4S2, VT-4S, VT-6S2, and VT-6S. No installation is
necessary other than that of the power cord and gauge tube.
NOTE: You must order gauge tube cables, type CF-XX-OFV, when using five-position cabinet models.
3.5 Gauge Tube Installation:
Situate the gauge tube in a clean, dry vacuum system with the open end pointing down so as to be self-draining
should any vapors condense in it (see Section 6.0). Screw metal tubes into 1/8" female NPT threads using a suitable
sealant; Teflon tape is recommended, or use Hastings Quick Connect O-ring seals for a vacuum tight installation.
Glass tubes have 10mm (3/8") OD tubulation.
Gauge tube may be operated immediately, but best results will be obtained after the tube has outgassed for approximately 1
hour.
This manual suits for next models
27
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