Geokon 4410, Инструкция по эксплуатации, Страница: 8 / 22

2
2. INSTALLATION
2.1 Preliminary Tests
Upon receipt of the instrument, the gage should be checked for proper operation (including the
thermistor). See Section 3 for readout instructions. When the shaft is fully retracted, the vibrating
wire is slack and may give an erratic reading. This is normal. Extending the shaft very slightly
the vibrating wire is put in tension and, in position B on the readout, the gage will read around
1500 to 2000 digits.
CAUTION! Do not rotate the transducer shaft beyond 180 degrees, or extend it beyond the
range of the gage (a reading of about 8000 digits).
Checks of electrical continuity can also be made using an ohmmeter. Resistance between the
gage leads should be approximately 150
Ω
, ±10
Ω
. Remember to add cable resistance when
checking (22 AWG stranded copper leads are approximately 14.7
Ω
/1000' or 48.5
Ω
/km, multiply
by two for both directions). Between the green and white should be approximately 3000 ohms at
25 °C (see Appendix B), and between any conductor and the shield should exceed two megohms.
2.2 Strandmeter Installation
Figure 2 - Model 4410 Strandmeter Installation
Note: References to the PVC grease tube in the following instructions are for strandmeters used
on strands that are to be embedded in concrete. For strands out in the open, the grease tube may
be omitted.
Strandmeter installation is as follows:
1)
Unbolt and separate the two halves of the clamps.
2)
Slide the upper half of the clamp with the large hole around the strand meter so that the coil
housing sits up against the shoulder in the clamp recess.
3)
Slide the PVC grease tube over the strandmeter and then the upper half of the clamp with the
small hole over the shaft end of the strandmeter.
4)
Place the assembly down so that the bottoms of the two clamps sit on a flat surface.
5)
Take the spacer bar and position it between the clamps. Make sure that the coil housing is
against the shoulder in the clamp, snug the two clamps up to the spacer bar.