Overview

The Olympus 27MG is an affordable ultrasonic thickness gauge 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 gauges. 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 gauge 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 Gauge Stand

Specifications

Measurements > Dual element transducer measurement mode	Time interval from a precision delay after the excitation pulse to the first echo
Measurements > Thickness range	0.50 mm to 635 mm (0.020 in. to 25.0 in.) depending on material, transducer, surface conditions, temperature
Measurements > Material velocity range	0.508 mm/μs to 18.699 mm/μs (0.020 in./μs to 0.7362 in./μs)
Measurements > Resolution (selectable)	Low: 0.1 mm (0.01 in.) Standard: 0.01 mm (0.001 in.)
Measurements > Transducer frequency range	2.25 MHz to 10 MHz (–3 dB)
General > Operating temperature range	-10 °C to 50 °C (14 °F to 122 °F)
General > Keypad	Sealed, color-coded keypad with tactile and audible feedback
General > Case	Impact-resistant and water-resistant, gasketed case with sealed connectors. Designed for IP65.
General > 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.)
General > Weight	340 g (12 oz)
General > Power Supply	3 AA alkaline batteries
General > Battery life operating time	150 h of typical battery life, 30 h continuous use with backlight
General > Explosive Atmosphere	Safe 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
General > Standards	Designed for EN15317
General > Alarm mode	Programmable Hi/Low set points with audible and visual indicators
Display > Display Hold/Blank mode	Holds or blanks the display after measurements
Display > Backlight	Electroluminescent backlight, Selectable as On or Auto On
Display > Receiver bandwidth	1 MHz to 18 MHz (–3 dB)
Display > Metric/English mode	Metric or English units
Display > Display languages	English, French, German, Spanish, Italian,Portuguese, Russian, Polish, and Swedish

Standard Package

27MG digital ultrasonic thickness gauge
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 Gauge 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.

Transducer	Item Number	Freq. (MHz)	Connector	Tip Diameter mm (in.)	Range (Steel)¹ mm (in.)	Temp. Range² ºC (ºF)	Cable	Item Number
D7910	U8454038	5.0	90°	12.7 (0.500)	1.00 to 254 (0.040 to 10.00)	0 to 50 (32 to 122)	Potted	—
D790	U8450002	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-SM	U8450009		Straight				LCMD-316-5B³	U8800353
D790-RL	U8450007		90°				LCLD-316-5G³	U8800330
D790-SL	U8450008		Straight				LCLD-316-5H	U8800331
D791	U8450010	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-RM	U8450011	5.0	90°	11.00 (0.434)	1.00 to 500.00 (0.040 to 20.000)	-20 to 400 (-5 to 932)	LCMD-316-5C	U8800345
D7912	Q4530005	10.0	Straight	7.5 (0.295)	0.50 to 25.00 (0.020 to 1.000)	0 to 50 (32 to 122)	Potted	—
D7913	Q4530006	10.0	90°	7.5 (0.295)	0.50 to 25.00 (0.020 to 1.000)	0 to 50 (32 to 122)	Potted	—
D794	U8450014	5.0	Straight	7.20 (0.283)	0.75 to 50.0 (0.030 to 2.000)	0 to 50 (32 to 122)	Potted	—
D797	U8450016	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-SM	U8450017	2.0	Straight	22.9 (0.900)	3.80 to 635.00 (0.150 to 25.000)	-20 to 400 (-5 to 752)	LCMD-316-5D	U8800355
D7226	U8454013	7.5	90°	8.90 (0.350)	0.71 to 50.00 (0.028 to 2.000)	-20 to 150 (-5 to 300)	Potted	—
D798-LF	U8450019	7.5	90°	8.90 (0.350)	0.71 to 50.00 (0.028 to 2.000)	-20 to 150 (-5 to 300)	Potted	—
D798	U8450018	7.5	90°	7.20 (0.283)	0.71 to 50.00 (0.028 to 2.000)	-20 to 150 (-5 to 300)	Potted	—
D798-SM	U8450020	7.5	Straight	7.20 (0.283)	0.71 to 50.00 (0.028 to 2.000)	-20 to 150 (-5 to 300)	LCMD-316-5J	U8800357
D799	U8450021	5.0	90°	11.00 (0.434)	1.00 to 500.00 (0.040 to 20.000)	-20 to 150 (-5 to 300)	Potted	—
MTD705⁴	U8620225	5.0	90°	5.10 (0.200)	1.00 to 19.00 (0.040 to 0.750)	0 to 50 (32 to 122)	LCPD-78-5	U8800332

¹ Dependent on material, transducer type, surface conditions, and temperature. Full range may require Gain Adjust.
² Maximum temperature with intermittent contact only.
³ Stainless steel cable available; consult Olympus for details.
⁴ Not certified to EN15317; these transducers are issued TP103 test certificates in accordance with ASTM E1065.