Torque sensor MHAA (microTor) for screwdrivers – 5, 10 and 25 N·m

The MHAA measures the torque actually delivered by a screwdriver during tightening, directly in the force flow. It is placed between the drill chuck and the bit: the hex shank is inserted into the quick-change chuck of the screwdriver, and the bit into the hex receptacle of the sensor. This allows electric and pneumatic screwdrivers to be tested and calibrated.

The most important features at a glance

• Three measuring ranges: 5 N·m (1 mV/V), 10 N·m and 25 N·m (2 mV/V each).
• Direct in the force flow: Tool holder with quick-change coupling, 1/4" hex – receptacle according to ISO 1173 Form F 6.3, shank according to ISO 1173 Form E 6.3.
• Compact: Total length 92 mm, housing diameter 25 mm, body length 42 mm.
• Accuracy: Linearity and hysteresis ≤ ±0.20 %, temperature influence on zero point and sensitivity each ≤ ±0.02 % per 1 °C.
• Robust design: Measuring body made of stainless steel, housing made of aluminum, protection class IP40 according to EN 60529.
• Rated speed: 4000 min⁻¹.

Technical data at a glance

• Sensitivity: 1 mV/V at 5 N·m · 2 mV/V at 10 and 25 N·m · Sensitivity tolerance ≤ ±0.2 % · Zero balance ≤ ±0.5 %
• Supply: 1…15 V, max. 18 V
• Resistances: Input 430 Ω ±20 · Output 350 Ω ±5 · Insulation resistance > 2 GΩ
• Temperatures: Reference +23 °C · Operating -10…+70 °C · Storage -20…+80 °C
• Mechanical limits: Rated torque 100 %FS · Limit torque 150 %FS · Breaking torque > 300 %FS · Permissible oscillation width 70 %FS
• Connection: Shielded PVC cable 105 °C, Ø 5.2 mm, 4 × 0.35 mm², 3 m – wires red (+ supply), black (– supply), white (+ signal), yellow (– signal), shield to housing
• Conformity: CE, RoHS, REACH · applied standards EN 61326-1 (2013) and EN 61010-1 (2013) · Directives 2014/30/EU, 2014/35/EU, 2011/65/EU, 2015/863, 2012/19/EU, 1907/2006 · Quality system according to EN ISO 9001 · Manufacturer's declaration of conformity dated 01.04.2019
• On request: Calibration protocol and ACCREDIA calibration certificate according to ISO/IEC 17025, each for clockwise and counter-clockwise rotation

Accessories

Mechanical accessories are not required for this model: both couplings are part of the sensor. Incremental encoders and square couplings are not available – these are options for the rotating models MDAA (RT2) and MDAB (RT8).