MAC MultiAmplifier Card

The MAC is an eight-channel amplifier - interface consisting of eight independent tension amplifiers on a single circuit card.

MAC MultiAmplifier Card

The MAC is an eight-channel amplifier - interface consisting of eight independent tension amplifiers on a single circuit card. The MAC provides excitation voltage to connected tension transducer pairs, and puts out a 0-to-10Vdc signal proportional to tension for each pair of transducer signal inputs. The 0-to-10V outputs can be used as inputs to drives, PLC's or other tension monitoring or closed-loop tension control devices. Damped 0 - 1mA outputs are also available to drive tension meters. The 5.5" x 7" MAC Card installs flat in the machine's control panel. All external connections are by terminal strips.

Designed initially for the printing industry, the MAC MultiAmplifier card helps reduce and eliminate the incidence of web breaks on running presses. The MAC also performs well in any application where process web tension needs to be monitored from multiple locations. The TLS (tension limit switch) option allows high and low alarm trip points to be set that warn the press operator if running tension in a particular zone moves outside set operating limits.

The advantages of the MAC MultiAmplifier Card when compared to single channel amplifier/ interface cards are: 1) the ability to read out tension from sensor points along an entire production line from one location, either remotely or at the machine; and, 2) the lower cost of installation versus a single, dedicated tension interface/amplifier for each sensor point.


  • 24 Vdc power input
  • 0 to 10Vdc output (proportional to tension) from each channel
  • 0 to 1mAdc damped meter output proportional to tension from each channel.
  • 5 Vdc transducer excitation
  • Single calibration range
  • For use with any DFE tension transducers
  • Damping for tension meter output


  • IMUX Multiplexer. An enclosed tension signal display device with a meter and switch for selecting between multiple (up to 32) MAC tension inputs or 0 to 10Vdc inputs from other DFE tension indicator devices. Requires 115V, 60Hz, and 24Vdc power input.
  • Tension Meter (#722-1385). 3.5", 0-1mA dc. For each amplifier. Also available in own enclosure (#722-1453).
  • Tension Meter in enclosure (#723-1762) with 8 position switch to select any output.


  • Enclosure (ENCL). Optional enclosure can hold one MAC and one TLS card and a power supply (PS), or two MAC's and a power supply.
  • Extended Range (XRE). Allows extra sensitivity at low tension. Applies to all eight amplifiers. Transducers must have XR option also.
  • Mounting Plate (MP). Steel plate with standoffs for mounting of board.
  • Power Supply (PS). 115/230 Vac 50/60 Hz, 24Vdc output power supply. Can be mounted separately or in enclosure with amplifier and TLS cards.
  • Tension Limit Switch (TLS). Activates an output when tension reaches an adjustable set point. There are eight separate TLS circuits on one card. Used for web break detection, and for preventing web breaks.

Related Products

Pnuematic Brakes

Pnuematic Brakes

Learn More
Model C Transducer

Tension Indicators

Learn More
SteadyWeb Controllers

Tension Controllers

Learn More

Request Info

Anticipated Response Time: Within 24 Hours