27MG

The 27MG is a basic ultrasonic thickness gage designed to make accurate measurements from one side on internally corroded or eroded metal pipes and parts. It is lightweight, durable, and ergonomically designed for easy, one-hand operation.


Overview

The Olympus 27MG is an affordable ultrasonic thickness gage designed to make accurate, measurements from one side on internally corroded or eroded metal pipes, tanks, and other equipment. It weighs only 12 oz. (340 g) and is ergonomically designed for easy, one-hand operation. Despite its compact size, the 27MG has many innovative measurement features utilizing the same technologies that are available on our more advanced thickness gages. The durable, rugged 27MG is battery-operated and features a large, backlit LCD with easy-to-read numerals, and an intuitive color-coded keypad with direct access to many key features.

Standard features include Automatic Probe Recognition to ensure optimal transducer performance, Auto Zero compensation to enhance the accuracy of measurements on hot surfaces, Gain Adjust to improve measurements on sound-attenuating materials such as cast metals, Differential mode, Hi-Low Alarm settings, and a Min./Max. mode that captures the minimum or maximum thickness at 20 measurements per second.

The 27MG is designed for inspectors and maintenance engineers that need to monitor the wall thickness in metal pipes, tanks, beams, and structural supports that are susceptible to corrosion on the inside surface. An ultrasonic thickness gage provides a quick, cost-effective solution by transmitting sound into the material from the outside, making it unnecessary to damage the part.

Transducers

The 27MG comes standard with the low-cost D7910 dual element transducer that enables you to make thickness measurement for many basic corrosion applications. For measurements on very thin or thick materials, or small diameter pipes, Olympus has available a full line of dual element transducers. Olympus transducers compatible with the 27MG feature Automatic Probe Recognition that optimizes transducer performance by automatically recalling the default V-path correction.

27MG with the optional Protective Rubber Boot with Neck Strap and Gage Stand
27MG with the optional Protective Rubber Boot with Neck Strap and Gage Stand

Specifications

27MG Specifications

 

Measurements
Dual element transducer measurement modeTime interval from a precision delay after the excitation pulse to the first echo
Thickness range0.50 mm to 635 mm (0.020 in. to 25.0 in.) depending on material, transducer, surface conditions, temperature
Material velocity range0.508 mm/μs to 18.699 mm/μs (0.020 in./μs to 0.7362 in./μs)
Resolution (selectable)Low: 0.1 mm (0.01 in.)
Standard: 0.01 mm (0.001 in.)
Transducer frequency range2.25 MHz to 10 MHz (–3 dB)
General
Operating temperature range-10 °C to 50 °C (14 °F to 122 °F)
KeypadSealed, color-coded keypad with tactile and audible feedback
CaseImpact-resistant and water-resistant, gasketed case with sealed connectors. Designed for IP65.
Dimensions (W x H x D)84.0 mm x 152.4 mm x 39.6 mm (3.31 in. x 6.0 in. x 1.56 in.)
Weight340 g (12 oz)
Power Supply3 AA alkaline batteries
Battery life operating time150 h of typical battery life, 30 h continuous use with backlight
Explosive AtmosphereSafe operation as defined by Class I, Division 2, Group D, as found in the National Fire Protection Association Code (NFPA 70), Article 500, and tested using MIL-STD-810F 511.4 Procedure I
StandardsDesigned for EN15317
Alarm modeProgrammable Hi/Low set points with audible and visual indicators

 

Display
Display Hold/Blank modeHolds or blanks the display after measurements
BacklightElectroluminescent backlight, Selectable as On or Auto On
Receiver bandwidth1 MHz to 18 MHz (–3 dB)
Metric/English modeMetric or English units
Display languagesEnglish, French, German, Spanish, Italian,Portuguese, Russian, Polish, and Swedish

 

Standard Package

  • 27MG digital ultrasonic thickness gage
  • Dual element transducer
  • AA alkaline batteries
  • Test block and couplant
  • Carrying case
  • Wrist strap
  • User’s manual on CD
  • Getting started Guide
  • Measurement features: Min./Max. mode, Differential mode, Gain Adjust Freeze mode, Automatic Probe Recognition, Zero Compensation

Standard inclusions may vary depending on your location. Contact your local distributor.

Optional Accessories

  • 2214E (U8880014): 5-step test block, English units
  • 2214M (U8880016): 5-step test block, metric units
  • 27MG/RPC (U8780343): Protective rubber boot with Neck Strap and Gage Stand

For additional accessories such as holders, wands, and couplants, please consult Olympus.

Transducers

Transducers with Automatic Probe Recognition

The 27MG is compatible with our complete line of easy interchangeable dual element transducers that vary in frequencies, diameters, and temperature capabilities to deal with virtually every application.

TransducerItem NumberFreq. (MHz)ConnectorTip Diameter mm (in.)Range (Steel)* mm (in.)Temp. Range** ºC (ºF)CableItem Number
D7910U8454038
5.090°12.7
(0.500)
1.00 to 254
(0.040 to 10.00)
0 to 50
(32 to 122)
Potted   ¯
D790U8450002


5.0

Straight

 

11.00
(0.434)

 

1.00 to 500.00
(0.040 to 20.000)


-20 to 500
(-5 to 932)
 

Potted¯
D790-SMU8450009StraightLCMD-316-5B†U8800353
D790-RLU845000790°LCLD-316-5G†U8800330
D790-SLU8450008StraightLCLD-316-5HU8800331
D791U8450010

5.0

90°11.00
(0.434)
1.00 to 500.00
(0.040 to 20.000)
-20 to 500
(-5 to 932)
Potted¯
D791-RMU84500115.090°11.00
(0.434)
1.00 to 500.00
(0.040 to 20.000)
-20 to 400
(-5 to 932)
LCMD-316-5CU8800345
D792U845001210Straight7.20
(0.283)
0.50 to 25.00
 (0.020 to 1.000) 
0 to 50
(32 to 122)
Potted¯
D793U845001390°Potted¯
D794U84500145.0Straight7.20
(0.283)
0.75 to 50.0
(0.030 to 2.000)
0 to 50
(32 to 122)

 Potted

¯
D797U8450016

2.0

90°22.9
(0.900)
3.80 to 635.00
(0.150 to 25.000)
-20 to 400
(-5 to 752)
Potted¯
D797-SMU8450017StraightLCMD-316-5DU8800355
D7226U84540137.590°8.90
(0.350)
0.71 to 50.00
(0.028 to 2.000)
-20 to 150
(-5 to 300)
Potted¯
D798-LFU8450019
D798U84500187.590°7.20
(0.283)
0.71 to 50.00
(0.028 to 2.000)
-20 to 150
(-5 to 300)
Potted¯
D798-SMU8450020StraightLCMD-316-5JU8800357
D799U84500215.090°11.00
(0.434)
1.00 to 500.00
(0.040 to 20.000)
 -20 to 150
(-5 to 300)
Potted¯
MTD705U86202255.090°5.10
(0.200)
1.00 to 19.00
(0.040 to 0.750)
0 to 50
(32 to 122)
LCPD-78-5U8800332

*Dependent on material, transducer type, surface conditions, and temperature. Full range may require Gain Adjust. **Maximum temperature with intermittent contact only. †Stainless steel cable available; consult Olympus for details.

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