27
APPENDIX A. SPECIFICATIONS
A.1 Earth Pressure Cells
Model:
4800
Earth Pressure Cell
(rectangular)
4800
Earth Pressure
Cell
(circular)
4810
Contact Pressure
Cell
4820
Jack-Out
Pressure Cell
Ranges:¹
70 kPa (10 psi)
170 kPa (25 psi)
350 kPa (50 psi)
700 kPa (100 psi)
1 MPa (150 psi)
2 MPa (300 psi)
3 MPa (435 psi)
5 MPa (750 psi)
7.5 MPa (1100 psi)
20 MPa (3000 psi)
70 kPa (10 psi)
170 kPa (25 psi)
350 kPa (50 psi)
700 kPa (100 psi)
1 MPa (150 psi)
2 MPa (300 psi)
3 MPa (435 psi)
5 MPa (750 psi)
7.5 MPa (1100 psi)
20 MPa (3000 psi))
350 kPa (50 psi)
700 kPa (100 psi)
1 MPa (150 psi)
2 MPa (300 psi)
3 MPa (500 psi)
5 MPa (750 psi)
350 kPa (50 psi)
700 kPa (100 psi)
1 MPa (150 psi)
2 MPa (300 psi)
3 MPa (500 psi)
5 MPa (750 psi)
Resolution:
±0.025% FSR
Accuracy:
4
±0.5% FSR (±0.1% FSR with a polynomial expression)
Linearity:
±0.5% FSR (standard), ±0.1% FSR (optional)
Overrange:
1.5 x Rated Pressure
Operating
Temperature:
-20 to +80° C
Excitation
Frequency
Range
1400-3500Hz
Output
Frequency
Range
2000-3000Hz
Cell
Dimensions:²
(active area)
150
×
250 mm
6
×
10"
230 mm OD
9" OD
230 mm OD
9" OD
125 mm OD
5" OD
Coil
Resistance:
150
Ω
Material:
316 Stainless Steel
Weight:
2.3 kg. (5 lbs.)
2.3 kg. (5 lbs.)
4.7 kg. (10.3 lbs.)
2.7 kg. (6 lbs.)
Electrical
Cable:³
Two twisted pair (four stranded conductor), 22 AWG
Foil shield (with drain wire), PVC jacket, nominal OD=6.3 mm (0.250")
Table 5 - Earth Pressure Cell Specifications
Notes:
¹ Consult the factory for other ranges available
² Consult the factory for other sizes available.
³ Consult the factory for alternate cable types.
4
The stated accuracy is the accuracy of the pressure transducer. The total system accuracy
depends on many factors, as discussed in Section 1.1.
A.2 Standard Temperature Thermistor
Range: -80 to +150° C
Accuracy: ±0.5° C
