Force Displacement Transducer
Model FT03

FT03

for In Vivo and In Vitro Isometric Force Measurements and Isotonic Displacement Measurements
Four-arm bonded strain gage elements
Very high stability, accurate to ±1%
Resolution as high as 25,000 to 1
Exclusive patented multirange* springs extend useful range from milligrams to kilograms
May be connected for differential forces
Heavy integral clamping handle – will take lots of abuse
No microphonics – single dimension gravitational effects
Typical drift spec 50 mg/hour
  * Each transducer equivalent to four single range transducers
DESCRIPTION

Four-bonded strain gages form a rugged bridge which measures the strain produced on a cantilever beam by the force applied. The housing is rugged and the handle can be clamped. Gravity effects are reduced to one dimension. High natural resonance is afforded by the cantilever. There are no pivots — no friction.

FEATURES

The FT03 is supplied with three sets of range springs providing four ranges. This yields a maximum working range of over 40 to 1 for the transducer, extending applications. With Grass Amplifier Systems, the FT03 gives full scale deflection with the application of a few milligrams of force.

An eye is provided on the beam shafts on each side of the cantilever to facilitate attachment to the preparation. Differential forces can be measured by connecting the gage between forces applied to the two beam shafts.

Also, an initial load can be applied and static forces can be balanced out to measure only the changing forces. The gage can be used to measure compression as well as tension.

APPLICATIONS

The FT03 Transducer was developed to measure muscle contractions isometrically. The ranges cover applications from single fibres to whole small rodent legs. Isotonic measurements can be made with externally applied springs.

The FT03 has been an industry standard and is especially suited for in vitro tissue bath contractility applications. The bonded strain gages are essentially impervious to tissue bath solutions. A range of 0 to 50 grams is the most sensitive range for many applications.

DYNAMIC SPECIFICATIONS
Color of Spring:

No Spring Used

Red & Black

Yellow & Black

Black
Maximum Working Range kg
0.05
0.2
1
2
Minimum Reliable Force mg
2
10
50
100
Self-Resonant Frequency Hz
85
170
330
500
Output mV/kgm/Volt Applied
30
7.5
1.5
0.7

STATIC SPECIFICATIONS
Maximum displacement, mm
1.1
Maximum force, kg
10
Maximum applied voltage, VDC
8
Nominal bridge resistance, ohms
350

Physical Size 
Physical Size   1" W x 1.25" H x 6" L
(2.5 cm x 3.2 cm x 15.2 cm)
Weight   3 oz. (84 g)
STANDARD ACCESSORIES SUPPLIED
3 pair range extension springs
3/32" allen wrench
2 "S" hooks
3 isotonic springs: black, silver, copper
1 shielded cable (either Model TAC-8, TAC-7, or TAC-4)

ORDERING INFORMATION
Model FT03   Force Displacement Transducer — 2 mg to 2 kg, general purpose
for connection to: Model 7P1, 7P14, 7P122 Preamplifiers
Model P122, CP122 Amplifiers, Model PI-1-ACDC (7400) Signal Conditioner
Model FT03-T4   Force Displacement Transducer — 2 mg to 2 kg, general purpose
for connection to: Model P11T Amplifiers
Model FT03-T8   Force Displacement Transducer — 2 mg to 2 kg, general purpose
for connection to: Model LP122 Amplifiers
Replacement Spring Sets 
Model HSG-GRM1105   Set of 6 isometric springs: 2, 1 and 0.2 kg, for FT03
Model HSG-ISO-SETS   Set of 3 isotonic springs for FT03
Replacement Part
Model GRM-2093   "S" Hook for FT03
Model 3/32 HEX KEY   3/32" allen wrench for FT03
Model TAC-4   5-foot (1.5 m) shielded cable for FT03 connection to: Model P11T Amplifiers
Model TAC-7   8-foot (2.4 m) shielded cable for FT03 connection to: Model 7P1, 7P14, 7P122 Preamplifiers, Model P122, CP122 Amplifiers, Model PI-1-ACDC (7400) Signal Conditioner
Model TAC-8   8-foot (2.4 m) shielded cable for FT03 connection to: Model LP122 Amplifier