MODEL 4420 VIBRATING WIRE CRACKMETER
| SPECIFICATIONS |
17
APPENDIX A.
SPECIFICATIONS
MODEL 4420 CRACKMETER
The table below lists the specifications for all models except for the Model 4420-3
Low Profile Crackmeter. For information on that model, refer to Appendix E.
TABLE 6:
Model 4420 Crackmeter Specifications
Notes:
¹ Minimum, greater resolution possible depending on readout.
² Depends on application.
³ Polyurethane jacket cable available.
Range:
6:
3 mm/0.125" 12 mm/0.50" 25 mm/1" 50 mm/2" 100 mm/4" 150 mm/6" 200 mm/8" 300 mm/12"
Resolution:¹
0.025% FSR
Linearity:
0.25% FSR
Thermal Zero Shift:²
< 0.05% FSR/°C
Stability:
< 0.2% / yr (under static conditions)
Overrange:
115% FSR
Temperature
Range:
-20 to +80 °C
-5 to +175 °F
Frequency Range:
1400-3500 Hz
Coil Resistance:
180
Ω
, +10
Ω
Cable Type:³
Two twisted pair (four conductor) 22 AWG
Foil shield, PVC jacket, nominal OD=6.3 mm (0.250")
Cable Wiring Code:
Red and Black are the VW Sensor, White and Green are the Thermistor.
Length: (midrange,
end to end)
312 mm/
12.3"
337 mm/
13.3"
362 mm/
14.3"
415 mm/
16.4"
573 mm/
22.6"
664 mm/
26.2"
889 mm/
35"
1205 mm/
47.5"
Coil Assembly
Dim.: (length x OD)
31.75 mm/25.4 mm
1.25"/1"