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Technical data技术指标： MFHT 5
Accuracy class 准确等级　　　　　　　　　　　EN ISO 95130.5
Measurement principal测量原理　　　strain-gauge full bridge全桥变形
Travel 　　　　　　　　　　　　　　　　　　　　　　　　　行程+/- 5 mm
Activating force 测量敏感最小受力　　　　　　　　　　　　　　 ≈ 10 cN
Contact pressure feeler arms触臂接触压力　　　　　　　　 ≈ 200 cN
Indication error (v. A.)*精度　　　　　　　　　　　　　　　　0,5 %
Indication error *分辨力　　　　　　　　　　　　　　　　1,5 µm
Initial gauge length 量程　　　　　　　　　　　　25 mm and 50 mm
Error of initial gauge length 测量误差　　　　　　　　　+/- 0,1 mm
Rated bridge resistant 额定桥电阻　　　　　　　　　　　　　350 Ω
Nominal sensitivity 名义敏感度　　　　　　　　　　　　　 2 mV/V
Recommended voltage supply建议电压　　　　　　　 max. 10 V (5 kHz)
Standard feeler arms 标准陶瓷杆耐温　　　Ceramic (Al23) up to 1700 °C
Other feeler arms (length and shape of edge )
陶瓷杆（边缘的长度和形状）要求　　　　　　　　　　　　　　　on request
Other initial gauge lengthson request
Weight 0.7 kg
Weight with clamping device 1.2 kg

* The larger value is admissible

图片1.png MFHT5.1-768x461.jpg

With validity of this issue all others lose their validity. All information is not-binding. Misprints and errors reserve.Review 2017.09.

Area of application
The MFHT 5 has been conceived as a highly accurate, sturdy measuring device for hot tensile tests in a folding furnace.
The measuring precision meets the requirements of the ISO 9513 class 0.5.
2 initial gauge lengths are offered as standard. Le 25 mm and Le 50 mm can be adjusted quickly and fast by turning over the feeler arms. Due to its extremely low activating force, the unit enables the testing of highly sensitive samples which permit only the lowest surface pressures.

Design and function
In a housing of anodized, high strength aluminum alloy 2 levers with play free tensioned ball bearings hold the feeler arms on rotating points. By means of these levers a strain gauge measuring spring will be activated. Due to this arrangement only forces from the tensile level of the sample are transmitted to the measuring spring. Tension springs press the feeler arms gently against the sample. When clamping the feeler arms both Le limit stops will be automatically released prior to measuring in order to prevent the application of preload force to the feeler arms.
An optional clamping/driving device will perform a quick clamping to the furnace as well as a smooth and gently driving of the feeler arms towards the sample.
Varying sample diameters, the reduction of the cross section and possibly existing faulty alignment are compensated for by a high precision parallel guide which is free from float.

Attention:
Do not operate the MFHT 5 without heat shield protector!
Operating Instructions
The MFHT offers 2 initial gauge lengths (25 and 50 mm). Depending on the desired initial gauge length, the feeler arms either have to be inserted into the MFHT 5 housing through the inner bores (Le 25 mm) or the outer bores (Le 50 mm) of the heat protecting shield.
Therefore the clamping screws ”A” have to be unlocked approximately one turn, using the Torx T10 screw- driver (standard accessory).The feeler arms have to be inserted into the MFHT housing to their mechanical stop, at the same time, care has to be taken, that the shapes of the feeler arms are in a horizontal position. Fi- nally, the clamping screws ”A” have to be pulled tight moderately.

Check:
When mounted in the correct way, the feeler arms shapes should now have a distance of approximately 190 mm with respect to the heat protection shield.

Note:
All settings have to be done with the MHFT 5 in measuring position, but un- clamped to a sample.

Gauge length-Setting
After the correct mounting of the feeler arms the initial gauge length can be adjusted accurately. Therefore the MFHT 5 has to be in the measuring po- sition and the screw Torx T10 “B” has to be unlocked. The upper feeler arm can now be adjusted.
Put now the adjusting pattern with the 90° groove on the feeler arms and tighten the screw “B”. The setting has to be checked again. With the correct setting, the Le should now be 25 mm respectively 50 mm (+/- 0.1 mm).

Note:
The feeler arms are not allowed to be clamped to a sample during these set- tings.
Attachment to the furnace
In order to attach the clamping device to the furnace, furnace fixing plate „H“ as well as connecting part „I“ have to be screwed on to the corresponding plate at the furnace.
Afterwards the guidance „F“ incl. the guiding pins has to be pulled forward manually.
Now, the MFHT 5 device incl. the guid- ance „F“ has to be fixed to the con- necting part „I“ by means of the two guiding pins and finally has to be clamped with lever „E“ .

Clamping to the sample
After attachment of the MFHT 5 incl. its clamping device (blue parts) at the fur- nace the feeler arms can be attached to the sample. Therefore the MFHT 5 has to be moved gently to the sample by means of the guidance, so that the red indicator „C“ becomes placed ap- proximately central with respect to the marks ( depending on sample cross- section ). In this position the stop „D“ has to be fixed left leveled This setting then is usable for further attachments with similar sample diameters.

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德国MF高温引伸计MFHT 5