Gauge Service, Repair, and Calibration

American Portable Nuclear Gauge Association

ASTM recommends a calibration of your gauge every 12 months. Calibrations are necessary due to the decay of the gauge Cs137 density source.

You should request a new calibration after a repair that involves electronics or GM tube replacement. It is the “drift” in electronics and the GM tubes that are also a top reason for needing a recalibration. Rough treatment of gauges can also impact calibration.

Any dispute between a gauge that has been properly calibrated vs. a gauge that is outside of calibration will generally be settled on the side of the properly calibrated gauge.

A properly calibrated gauge should work fine provided you perform timely standard counts. Take a standard count every day you use the gauge. Some manufacturers recommend several standard counts throughout the day, perhaps every few hours or as the materials being tested change.

If your gauge has not been used for over 2 months you will want to re-establish your standard count averages. To do this you need to take 4 new standard counts and then compare subsequent standard counts to the average of those 4 counts.

Nuclear Gauge Bottom

Other reasons for calibration problems include poor factory calibration, operator errors, operation near large vertical objects such as walls or vehicles, or close proximity to other gauges. Other factors include internal moisture, mechanical wear and detector tube misalignment.

All manufacturers perform gauge calibration, service and repair. You can also use 3rd party service centers.  Many of these independent service centers are run by former technicians of the manufacturers and their expertise is often equivalent or superior to the manufacturers.

Gauge on block

Many service centers offer “winter specials”. These specials are designed to entice you into sending your gauge in during the winter months when gauge operations slow down or halt due to the colder climate. It is beneficial to have your gauge worked on during this time of inactivity and it can save you money, sometimes as much as $200.00. Keep in mind that many companies wait until the “thaw” before sending their gauges in and this can result in longer lead times.

You can save a lot of money by shopping around for service. The aforementioned winter specials only last a couple of months and the same service during the summer will cost you a couple of hundred dollars more. Other service centers offer a standard price throughout the year and this price is much more attractive during the months when you are actually using the gauge.

When shopping for service keep in mind the shipping costs and gauge turn-around. If time is critical go with a highly qualified service provider with timely turn-around. The only thing worse than having a gauge go down in the middle of a job is getting a gauge back from service that has not been properly repaired.

You should expect the following as part of your gauge calibration:

    • 3 Block Calibration per ASTM & AASHTO & NIST Traceable
    • Source rod inspection
    • Scraper ring, wiper seal, gasket and bumper replacement
    • Mechanical inspection, lubrication & cleaning
    • Electronic inspection & adjustment
    • Battery/charging system check
    • Shipping case inspection and gauge cleaning
    • Replacement of radiation labels, if needed
    • Leak test

Basic gauge calibration service does not include other types of gauge repair and damage. Get a verbal quotation as to the expected costs of other gauge repairs. If the service provider cannot give you a specific quotation you will want to ask for a general parts list with pricing as well as labor charges. You may be surprised how much you can save comparing one service provider to another.

When shipping a gauge in for service make sure to fill out all necessary Return Goods forms as well as any regulatory forms for transfer of radioactive materials. The service center should be able to help you with shipping and forms.

Independent Service and Repair Centers: 

Atlantic Supply – Orlando
4187 S.W. 34th Street
Orlando, FL 32811
Ph: 800-569-8950, 407-246-6516

F: 407-246-6518

Atlantic Supply – Riveria Beach
3740 Prospect Ave, Unit #4
Riviera Beach, FL 33404
Ph: 800-535-7384, 561-844-3130

F: 561-844-3099

Atlantic Supply – Montgomery, AL
5400 Perimeter Parkway Ct
Montgomery, AL 36116
Ph: 866-917-3447, 334-280-2715

F: 334-280-2715

Laboratory Technical Services LLC
2016 N Palafox St
Pensacola, FL 32501-2145

R. M. Wester & Associates
215 Indacom
St Peters, MO 63376

Northeast Technical Services
75 Aileron Ct, Suite 4
Westminster, MD 21157

Maurer Technical Services, LLC
23331 Peralta Dr, Unit 4
Laguna Hills, CA 92653
949-951-6585 or 1-877-cal-nuke

Pacific Nuclear Technology
2525 West 10th St
Antioch, CA 94509-9111
800-706-3395   925-706-8300

MJW Technical Services
243 Root St, Suite 100
Olean, NY 14760

Aguinaga Technical Services
1924-C Calumet Drive
Sheboygan, WI 53081

Gauge Manufacturer Service and Repair:

CPN (Now owned by Instro Tek)
5052 Commercial Circle
Concord, CA 94520

Humboldt Scientific, Inc.
2525 Atlantic Ave.
Raleigh, NC 27604

InstroTek (now owns CPN)
5908 Triangle Drive
Raleigh, NC 27617

7315 South First Street
Oak Creek, WI 53154

3008 Cornwallis Rd
Research Triangle Park, NC 27709

If your company provides gauge service and repair and would like to be listed on this page please contact APNGA at or 240-888-6426.