Omega Engineering Thermometer M1982 0902 User Manual

VA Series  
Vapor Actuated Dial Thermometer  
INSTRUCTION  
SHEET  
M1982/0902  
General Description  
®
The OMEGA VA Series Vapor Actuated Thermometer is ideal for remote  
readings, such as panel installations, with capillary lengths from 5 to 100  
feet. This thermometer gives excellent readings above and below ambient  
temperature and, being vapor actuated, is not subject to reading errors due  
to either RFI/EMI interference or ambient temperature variations along the  
capillary tube length.  
Available Models  
Front Flange  
U-Clamp (Panel Mount)  
Figure 1. Case Style  
Rear Flange  
(Panel Mount)  
(Surface Mounted)  
Installing the Vapor Actuated Thermometer  
Unpacking Instructions  
Remove the Packing List and verify that you have received all equipment,  
including the following (quantities in parentheses):  
Vapor Actuated Dial Thermometer (1)  
Operator’s Manual (1)  
If you have any questions about the shipment, please call the OMEGA  
Customer Service Department.  
When you receive the shipment, inspect the container and equipment for  
signs of damage. Note any evidence of rough handling in transit.  
Immediately report any damage to the shipping agent.  
 
VA Series Vapor Actuated Dial Thermometer  
Flush Mount (Front Flange and U-Clamp)  
1. Make a circular cutout in the panel slightly larger than the case.  
2. Drill three (3) mounting holes for the Front Flange Model.  
3. From the front of the panel, pass the bulb and capillary through the  
cutout.  
4. Affix the head to the panel:  
4a. U-clamp Model: Tighten U-clamp(s) against the back of your  
panel.  
4b. Front Flange Model: Screw the flange to the front of your panel,  
using the screw holes that you drilled.  
Installing the Bulb  
NOTE  
If the bulb is installed more than 10 feet above or below the  
dial, it may be necessary to recalibrate the instrument.  
3
 
VA Series Vapor Actuated Dial Thermometer  
Standard Bulb Dimensions (inches)  
Immerse the thermometer stem at least A inches (or entire stem,  
whichever is less) in the medium being measured, for best reading.  
Union Connections  
CAUTION  
Tighten the thermometer to its fitting using a wrench  
applied to the hex or flats above the threads. Never tighten  
by hand.  
1
7
1. Unscrew and remove the 2" NPT fitting, using a 8" wrench.  
1
2. Screw the 2" NPT fitting into the threaded process opening.  
1
3. Insert the bulb through the 2" NPT fitting. Tighten it in place by  
screwing the jam nut into the top of the 2" NPT fitting with an 16"  
wrench.  
1
11  
4
 
VA Series Vapor Actuated Dial Thermometer  
NOTE  
Use a thermowell in all pressurized applications. Be sure  
case temperature does not exceed 200°F (93°C).  
Thermowells  
1. Remove the thermowell and screw it into the process so that no  
leaking occurs. Use thread sealant as required.  
2. Place the bulb in the thermowell. Tighten the bulb in place by  
1
11  
screwing the jam nut into the top of the 2" fitting with an 16" wrench.  
Bendable Extensions  
I . Place the bulb in the thermowell, or directly in the process.  
NOTE  
Use a thermowell whenever the bulb would be exposed to  
pressure, fluid velocity, or corrosive media.  
1
2. Slide the compression fitting down and screw the 2" NPT fitting into  
the process (or thermowell) threads.  
3. Tighten the top hex of the sliding union until the bendable extension  
does not slide in or out.  
4. Gently bend the remaining portion of the extension out of the way.  
Operation  
2
Recommended operating temperature is in the upper 3 of the dial scale.  
5
 
VA Series Vapor Actuated Dial Thermometer  
Vapor actuated thermometers give excellent readings when the bulb  
temperature is either above or below the temperature of the indicating  
head. Avoid applications in which the bulb and head are the same  
temperature (ambient applications). If the bulb “crosses ambient” (i.e.,  
goes from hotter than the indicating head to cooler or vice versa), some  
pointer fluctuations will occur for up to two minutes during this  
transition.  
Recalibration  
The VA Series vapor actuated thermometers are manufactured with  
threaded, press fit and snap-ring lenses which can be easily removed  
for field calibration.  
To recalibrate your vapor actuated thermometer:  
1. Remove the thermometer from its fitting.  
2. Remove the lens.  
4. Immerse the bulb totally in an agitated liquid for at least 3 minutes  
with a master reference thermometer, until they reach equilibrium.  
5. Use a wrench, coin or screwdriver to turn the slotted hex nut on the  
back of the thermometer case until the pointer is at the proper  
reading on the scale.  
6. Replace the lens and reinstall the thermometer in its fitting.  
Care of the Vapor Actuated Thermometer  
• Avoid bending the stem, as this will result in frictional errors in  
indication.  
• Do not kink or flatten the capillary tube.  
• Dampen any capillary vibration, as this may cause capillary breakage  
over time.  
6
 
VA Series Vapor Actuated Dial Thermometer  
Specifications  
Dial Sixes:  
Dial:  
1
1
1
2", 2 2", 3 2", 4 ⁄  
2
"
Aluminum with white finish and black markings  
Furnished standard adjustable  
Pointer:  
Movement:  
Brass with precision gearing  
Bourdon Tube: Phosphor bronze  
Accuracy:  
Case:  
Plus or minus one scale division  
Stainless steel on all front flange and U-clamp models.  
1
Back flange models in stainless (2"), black steel (3 2")  
1
or Valox (4 2")  
1
1
Process  
Plain bulb, 2" NPT Union, 2" NPT sliding union  
Connection:  
on 12 Connection: bendable extension, or thermowell.  
1
1
Window:  
Polycarbonate. Glass in 3 2" and 4 2" back flange  
models  
7
Bulb:  
Stainless steel or nickel plated copper. Bulb O.D. 16"  
1
(optional ⁄4" O.D. x 2" length on -40 to 65°F range  
only). Bulb lengths vary from 2" to 6" depending on  
capillary length  
Capillary:  
Nickel plated copper, copper with bronze braid  
armor, stainless steel, stainless steel with stainless  
steel armor. Capillary lengths 1 to 100 feet (standard  
length 5 feet)  
Ranges:  
Over twenty °F and °F/°C ranges available, from -40°  
to +450°F  
Applications:  
Control panels, chemical processing, pipelines, food  
processing, OEM applications, ovens, solar heating,  
Vapor actuated thermometers give excellent readings when  
the bulb temperature is either above or below the  
temperature of the indicating head. Avoid applications in  
which the bulb and head are the same temperature  
(ambient applications). If the bulb “crosses ambient” (i.e.,  
goes from hotter than the indicating  
7
 
Servicing Europe:  
Benelux:  
Postbus 8034, 1180 LA Amstelveen, The Netherlands  
Tel: +31 (0)20 3472121  
FAX: +31 (0)20 6434643  
OMEGAnet® Online Service  
Internet e-mail  
Toll Free in Benelux: 0800 0993344  
Czech  
Rudé armády 1868, 733 01 Karviná 8  
Servicing North America:  
Republic:  
Tel: +420 (0)69 6311899  
Toll Free: 0800-1-66342  
FAX: +420 (0)69 6311114  
USA:  
ISO 9001 Certified  
One Omega Drive, Box 4047  
Stamford CT 06907-0047  
Tel: (203) 359-1660  
France:  
11, rue Jacques Cartier, 78280 Guyancourt, France  
Tel: +33 (0)1 61 37 29 00 FAX: +33 (0)1 30 57 54 27  
Toll Free in France: 0800 466 342  
FAX: (203) 359-7700  
Canada:  
976 Bergar  
Laval (Quebec) H7L 5A1  
Tel: (514) 856-6928  
Germany/  
Austria:  
Daimlerstrasse 26, D-75392 Deckenpfronn, Germany  
FAX: (514) 856-6886  
Tel: +49 (0)7056 9398-0  
FAX: +49 (0)7056 9398-29  
Toll Free in Germany: 0800 639 7678  
For immediate technical or application assistance:  
®
United  
One Omega Drive, River Bend Technology Centre  
Northbank, Irlam, Manchester  
USA and  
Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA  
Customer Service: 1-800-622-2378 / 1-800-622-BEST  
®
Kingdom:  
Canada:  
®
ISO 9002 Certified M44 5BD United Kingdom  
Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN  
TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA  
Tel: +44 (0)161 777 6611  
FAX: +44 (0)161 777 6622  
Toll Free in United Kingdom: 0800-488-488  
Mexico:  
En Espan˜ol: (001) 203-359-7803  
FAX: (001) 203-359-7807  
It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its  
products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.  
The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and reserves the right to alter  
specifications without notice.  
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.  
WARRANTY/DISCLAIMER  
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from  
date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal one (1) year product  
warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each  
product.  
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will issue an  
Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be  
defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the  
purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or  
unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of  
having been damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification;  
misapplication; misuse or other operating conditions outside of OMEGA’s control. Components which wear are not warranted,  
including but not limited to contact points, fuses, and triacs.  
OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility  
for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with  
information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it will be as  
specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND  
WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY  
WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION  
OF LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of OMEGA with respect to this  
order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the  
purchase price of the component upon which liability is based. In no event shall OMEGA be liable for consequential,  
incidental or special damages.  
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under 10 CFR  
21 (NRC), used in or with any nuclear installation or activity; or (2) in medical applications or used on humans. Should any Product(s)  
be used in or with any nuclear installation or activity, medical application, used on humans, or misused in any way, OMEGA assumes  
no responsibility as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify OMEGA and  
hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner.  
RETURN REQUESTS / INQUIRIES  
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY  
PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER  
SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the  
outside of the return package and on any correspondence.  
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.  
FOR WARRANTY RETURNS, please have the following informa-  
tion available BEFORE contacting OMEGA:  
1. Purchase Order number under which the product was  
PURCHASED,  
2. Model and serial number of the product under warranty, and  
FOR NON-WARRANTY REPAIRS, consult OMEGA for cur-  
rent repair charges. Have the following information avail-  
able BEFORE contacting OMEGA:  
1. Purchase Order number to cover the COST of the repair,  
2. Model and serial number of the product, and  
3. Repair instructions and/or specific problems relative to the  
product.  
3. Repair instructions and/or specific problems relative to  
the product.  
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in  
technology and engineering.  
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.  
© Copyright 2002 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated, or  
reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written consent of OMEGA ENGINEERING,  
INC.  
M1982/0901  
 

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