­Product Information

HEIDENHAINMETRO
MT 12 Series
MT 25 Series
Incremental Length Gauges

July 2013

HEIDENHAIN-METRO
MT 12, MT 25 series• Sturdy design• Plunger actuation by cable lifter, by the workpiece or pneumatically

MT 12
MT 12 BMT 12 P

ML = Measuring length® = Reference mark positionÀ = Air connection for 2 mm tube
Á = Clamping area

MT 25
MT 25 BMT 25 P

2

HEIDENHAIN-METRO MT12/MT 25 Series Product Information    7/2013

Specifications

MT 12
MT 25

Plunger actuation

By cable or measured object

Pneumatic

Position of plunger at rest

ExtendedRetracted

Plunger guideway

Sliding guideMeasuring standard

DIADUR grating on glass; grating period 10 µm

System accuracy± 0.5 µm

Reference markApprox. 5 mm below upper stop

Measuring range

MT 12MT 25

Gauging force*
Vertically downward
Vertically upward
Horizontal

MT 12 BMT 25 B

Ball-bush guideMT 12 P
MT 25 P

Sliding guide

12 mm
25 mm
From the integral spring
0.6 N to 0.85 N
0.28 N to 0.6 N
0.48 N to 0.73 N

From the integral spring
0.6 N to 0.85 N
0.28 N to 0.6 N
0.48 N to 0.73 N
Inherent weight of the plunger in version without spring:
MT 12 B: 0.12 N downward
MT 25 B: 0.16 N downward

From application of compressed air
0.2 N to 1.1 N
0.2 N to 0.9 N
0.2 N to 1.0 N

Radial force1)

 0.2 N

 0.8 N

 0.2 N

Operating attitude

Any

Any
Version without spring:vertically downward

Any

Vibration 55 to 2 000 Hz
Shock 11 ms

 100 m/s (EN 60 068-2-6)
 1000 m/s2 (EN 60 068-2-27)

Protection EN 60 529

IP 50

Operating temperature
Storage temperature

10 °C to 50 °C; reference temperature 20 °C–30 °C to 70 °C

FasteningClamping shank ¬ 8h6

Weight without cable2MT 12
MT 25120 g
200 g

IP 60250 g
300 gInterface» 11 µAPP

Measuring velocity

 60 m/min (plunger coupled; depending on the subsequent electronics)

Electrical connection

Cable 1.5 m with M23 connector (male) 9 pin

Cable length 30 m with HEIDENHAIN cable

Voltage supply

5 V DC ± 0.25 V/< 70 mA* Please select when ordering1)
Mechanically permissible

HEIDENHAIN-METRO MT12/MT 25 Series Product Information    7/2013

3

HEIDENHAIN-METRO
MT 12W, MT 25W series• Splash-proof, sturdy design• Plunger actuation through the workpiece or negative gauge pressure
MT 12W

ML = Measuring length® = Reference mark positionÀ = Air connection for 2 mm tube

MT 25W

4HEIDENHAIN-METRO MT12/MT 25 Series Product Information    7/2013

Specifications

MT 12W
MT 25W

Plunger actuation

Through measured object or application of negative gauge pressure (0.8 bar absolute)

Position of plunger at rest

Extended

Plunger guideway

Sliding guideMeasuring standard

DIADUR grating on glass; grating period 10 µm

System accuracy± 1 µmReference markApprox. 5 mm below upper stop

Measuring range

MT 12MT 2512 mm
25 mm
With extending plunger
3.5 N to 0.5 N
3 N to 0.2 N
3.25 N to 0.35 N

Gauging force
Vertically downward
Vertically upward
Horizontal1)

Radial force

 0.2 N

Operating attitude

AnyVibration 55 to 2 000 Hz
Shock 11 ms

 100 m/s (EN 60 068-2-6)
 1000 m/s2 (EN 60 068-2-27)

Protection EN 60 529

IP 64

Operating temperature
Storage temperature

10 °C to 50 °C; reference temperature 20 °C–30 °C to 70 °C

Fastening

Plane surface 59 mm x 14 mm; 2 M6 screws

Weight without cableWith retracting plunger
4.4 N to 1.4 N
3.8 N to 1.4 N
3.95 N to 1.05 N2MT 12
MT 25400 g
500 gInterface» 11 µAPP

Measuring velocity

 60 m/min (plunger coupled; depending on the subsequent electronics)

Electrical connection

Cable 1.5 m with M23 connector (male) 9 pin

Cable length 30 m with HEIDENHAIN cable

Voltage supply

5 V DC ± 0.25 V/70 mA1)

Mechanically permissible

HEIDENHAIN-METRO MT12/MT 25 Series Product Information    7/2013

5Electrical connection

Pin layout
9-pin connector, M2315-pin D-sub connector
For ND 28x/PWM 20 or on encoder

Voltage supply
3

Incremental signals

491256786193

11147Housing
42UP0V

External
shieldInternalshield

I1+

I1–

I2 +I2–I0 +I0–Brown

White–White/Brown

Green

YellowBlue

RedGrayPink

UP = Power supply
Vacant pins or wires must not be used!

Shield on housing
Color assignment applies only to extension cable.

PUR connecting cable ¬ 8 mm [3(2 × 0.14 mm2) + (2 × 1 mm2)]; AV = 1 mm2Complete
With M23 coupling (female), 9-pin andD-sub connector (male), 15-pin for ND 28x,EIB 741; only 1 VPP: ND 11xx, ND 12xx

653231-xx

Complete
With M23 coupling (female), 9-pin andD-sub connector (female), 15-pin, for
ND 780, PT 880, IK 220

368172-xx

With one connector
With M23 coupling (female), 9-pin

309780-xx

Complete
With M23 coupling (female), 9-pin andM23 connector (male)

309774-xx

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1068623-20 · 7/2013 · PDF

This Product Information supersedes all previous editions, which thereby
become invalid. The basis for ordering from HEIDENHAIN is always theProduct Information valid when the contract is made.
For more information• Catalog: Length Gauges