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Available Options
  • Enhanced Performance - Code C
  • Optical Speed Pickup - Code O
  • Magnetic Speed Pickup - Code Z

High Capacity Bearingless Digital Torquemeters

Model # 86000V Series

MCRT® 86000V Torque Transducers output shaft torque with 0.01% resolution. Digital, Analog and FM formats are simultaneously available. Industries highest overload and overrange ratings assure safety and accuracy even when the driveline has high peak to average torque ratios. Important features include non-critical installation, temperature data, max/min capture and absence of manual adjustments.

Range, scaling, calibration and null data are stored in rotor nonvolatile memory and transferred to the stator during startup. That assures accuracy, without re-calibration, if rotors and stators are replaced or intermixed. Bi-polar, rotor shunt cal can be enabled with stator switches, logic I/O or, via the Com Port. Choose from ten units of measure without re-calibrating. When you re-calibrate, earlier calibrations are archived. Eleven selectable Bessel data filters avoid overshoot errors and delay distortion.

Multiple bridges sense torque and provide immunity to extraneous loads. The radial torque path yields short length, unsurpassed torsional stiffness and deflection resulting in the highest installed system response. The torquemeter attaches to your drive without an additional coupling. The result is low overhung moment, short length and minimal installed space. Himmelstein has made similar, radial path sensors for decades including automotive torque wheels, pulley torquemeters and chassis roll torque sensors.

The sensors’ output is digitized on the rotor and then sent to the stator where analog, frequency and Com Port outputs are created. Choose RS232, RS422, or RS485 communications. Included software interfaces with your Windows-based PC. It displays real time data, does time plots and stores test results. Password protection may be invoked.

Exceptional Immunity To Noise And Interference From ISM Transmitters

To achieve short length, high stiffness and wide signal bandwidth, bearingless sensors use unshielded antennae. As a result, any device (including a like torquemeter) operating at or near its carrier frequency, can cause interference and data errors.

Of special concern are Industrial, Scientific and Medical (ISM) devices. Under FCC rules, they can generate unlimited energy and field strength. High power ISM devices are commonplace in industrial environments. Furthermore, billions of RFID tags also operate at ISM frequencies. These ubiquitous products are used for inventory control, parts tracking, controlling personnel access, etc.

Most Bearingless Torque Flanges use a single ISM frequency for power and data; usually 6.78 or 13.56 MHz. As a result, they are susceptible to interference from ISM Transmitters. Furthermore, FCC rules permit high power/fields only within a narrow band; ±7 kHz for a 13.56 MHz device. For unlicensed use outside that band, field strength must be low; # 25 μV/m at 300 meters for a 13.56 MHz carrier. Because real-time data transmissions are several MHz wide, these devices risk violation of FCC regulations.

Himmelstein Bearingless Torque Transducers tolerate ISM devices and other noise sources. They use separate non-ISM frequencies for power and data, have field strengths within FCC rules, powerful 12 pole signal filters and near field (not radiated field) signal transfer. Should a proprietary algorithm detect noise or interference, the system automatically shifts to a clear channel. An important benefit of this feature is the ability to install torquemeters close to each other without interference. That can make possible otherwise impractical installations and can yield significant space and cost savings.

General Specifications

 

Code N Performance

Code C Performance

Torque Range

Factory Set @ Transducer Full Scale Torque. Field Resettable to any lower value; see Note 1.

Units of Measure

User may select from lbf-in, lbf-ft, ozf-in, ozf-ft, N-m, kN-m, N-cm, kgf-m, kgf-cm, gf-cm without re-calibration

Accuracy2 (nonlinearity, hysteresis & repeatability)

<±0.1 (End Point, % of Range)

<±0.05 (End Point, % of Range)

Bi-polar Shunt Calibration Enable

From Stator Switches (one CW, one CCW), via TTL I/O, or PC Com Port using furnished software.

Zero Drift (% of Range/deg. F.)

<±0.002

<±0.001

Span Drift (% of Reading/deg. F.)

<±0.002

<±0.001

Temperature Ranges (deg. F.)

Compensated Range: +75 to +175; Usable Range: -25 to +185; Storage Range: -65 to +225

Rotor to Stator Maximum Misalignment (inches)

Axial: ±0.4, Radial: 0.3; If Speed Pickup Option is installed then maximums may be reduced - call factory.

Rotational Effects (% of Range)

#±0.01

Analog Output Signals6, Auto-Scaled

 

MCRT® 86000V Full Scale Torque3

Default is ±10V with 50% overrange (±15V). User may select ±5V with 50% overrange (±7.5V). Caution: see Note 7.

MCRT® 87000V Full Scale Torque3

Default is ±5V with 300% overrange (±15V). User may select ±10V with 50% overrange (±15V). Caution: see Note 7.

Signal Filter Cutoff Frequency4

Field selectable from 1 to 1 kHz in ten 1-2-5 steps plus 3 kHz selected from a remote PC using software furnished. Filters have Bessel Response; no delay distortion or overshoot errors.

Frequency Modulated Output, Auto-Scaled

Frequency: 10±5 kHz or 20±10 kHz or 40±20 kHz; field changeable (Default = 10±5 kHz); TTL square wave output.

Overrange (% of Range, see Application Note 20805)

50 to 300; model/user selection dependent - see above. Applies to analog, Digital and FM (except for negative side) Outputs.

System Resolution (% of Range)

0.01

Output Noise, All Outputs (% of Range)

<0.01 at 1Hz, <0.01 at 10 Hz, < 0.015 at 100 Hz, <0.028 at 1 kHz and <0.041 at 3 kHz.

System Response

Torque is sampled @ 20 kHz. Its’ 3 db bandwidth is 3 kHz but can be reduced by filters (see above)

Rotor-to-Stator Transfer Rate

1.25 MBaud

RS232, RS422, RS485 Communications Port

Com port outputs Torque and Temperature with units of measure. Inputs torque range if other than sensor full scale, selects units of measure, selects BAUD Rate, and permits remote computer control of the test.

BAUD Rate

9,600 to 230,400 (default is 115,200); Drivers are protected for short circuit (current limit) and ±15kV ESD protected

Maximum Cable Length

RS232 = 50 feet, RS422/485 = 4,000 feet; 120 Ohm termination may be accessed via software.

Interface Software

Provided to interface with Windows-based PC. Includes interconnect cable for a PC.

I/O Lines

5 input and 2 output, all are user assignable. Default for 5 inputs are +CAL, -CAL, TARE, CLEAR TARE, and RESET MAX/MIN.

Status LED’s (on Stator Keypad)

Three Color Coded LED’s: Power (Yellow = Power-up, Green = OK, Red = Fault); Data (Green = OK, Red = Data Error); Rotor Temperature (Green = In Operating Range, Red = Out of Operating Range).

Keypad Control Switches

+ CAL invokes CW Rotor Shunt Cal, -CAL invokes CCW Rotor Shunt Cal, Both held simultaneously for 5 seconds invokes TARE.

Rotor Temperature, Auxiliary Measurement

Rotor temperature is outpout via Comp Port. Range is 0 to 185 degrees F.; Accuracy is ±2 degrees. See above for status LED’s.

Option Code Z

30 to 180 pulses/revolution (model dependent) Zero Velocity Speed Pickup.

Supply Voltage/Power5

10 to 26 VDC @ 6 Watts with Antenna aligned to 9 Watts with maximum specified misalignments