700218-25-0006 Rev. X
1 of 4
Type 4-137
VELOCITY VIBRATION TRANSDUCER
Made in the United States of America
DESCRIPTION
The 4-137 is a seismic mass type velocity transducer designed for measuring radial vibrations at high temps up to +700°F
(+371°C). A seismic mass magnet moves on special ceramic bearings. A coil is attached to the case, and movement
between the magnet and coil produce the output signal when the case vibrates. This air damped system operates above
its natural frequency. The voltage output is proportional to velocity.
SPECIFICATIONS
Sensitivity:
@+77
°
F (+25°C), 100 Hz, 1 IPS (25.4 mm/s) RMS into 10,000 ohm resistive load
4-137-0006:
60 ±3 mV/ ips (Triangle Base, w/ integral 6 ft. (1.83m) cable)
4-137-0011:
145 ±3 mV/ ips (Square Base, w/ integral 20 ft. (6m) cable)
4-137-0015:
145 ±3 mV/ ips (Square Base, w/ integral 10 ft. (3m) cable)
4-137-0016:
145 ±3 mV/ ips (Square Base, w, integral 14 ft. (4.2m) cable)
4-137-0022:
105 ±3 mV/ ips (Square Base, w/ integral 3 ft. (.9m) cable)
4-137-0121:
145 ±3 mV/ ips (Square Base, w/ integral 30 ft. (9m) cable)
Sensitivity at Temperature:
At an operational temperature of +900°F the sensitivity will be
≅
-20% of the
stated sensitivity.
Mounting Orientation:
Sensitive axis is in longitudinal direction
Frequency Range:
45 – 2000 Hz
Amplitude Range:
0.1 inch (2.5 mm) pk-pk maximum
Acceleration Range:
1 to 50 g peak vertical
1.5 to 50 g peak horizontal
Linearity:
±5% from 1 to 50 g peak
Transverse Response:
2% maximum
Temperature Range:
-40
°
F to +700
°
F (-40°C to +371°C)
Thermal Coefficient of Sensitivity:
0.02%/°F from ref77°F (0.011%/°C from ref25°C)
Shock:
50
g
Damped Resonant Frequency:
20 Hz nominal
Excitation: Self-generating
Coil Resistance:
450 ±25% ohms at reference temperature 77°F
Insulation Resistance:
1 meg-ohms minimum at +700°F (+371°C)
Polarity:
Pin 2 is positive when case is moved away from base.
Accessories Included:
Calibration Record
INSTALLATION
Mounting
Rigidly attach the transducer to a clean machined flat surface of the equipment under test using the
appropriate size screws and lock washers. Be sure to tighten the screws securely (20 – 25 in/lb).
Wiring
For non-hazardous locations the transducer should be wired according to figure 1 (page 2).
For hazardous locations, the wiring method is dependant on the area classification.
Class 1, Division 2, Groups ABCD T6-T1
EEx nA II T6-T1 X
:
Transducer may be installed without the use of a safety barrier. Wiring to the transducer must comply
with the safety requirements of the hazardous area in which it is mounted. Reference figure 1 (page
2) for wiring configuration.
Class 1, Division 1, Groups ABCD T6-T1
II 1 G EEx ia IIB or IIC T6-T1:
Transducer may be connected through a safety barrier to the safe area receiver in accordance with
figure 2 (page 3).
CAUTION:
Never apply in excess of 45VDC across the terminals.