Teledyne 4250, Installation And Operation Manual, Page: 18 / 204

4250 Flow Meter
Section 1 Introduction
1-6
CAUTION
If you disassemble the AV sensor for cleaning, do not touch the
exposed metal diaphragm inside the probe with either tools or
your fingers. The diaphragm is very fragile. Deforming it even
slightly may place a permanent offset on the transducer, ruin-
ing it (and the rest of the sensor). Use only gently running
water to clean the probe.
See Section 5 for information on cleaning the pressure trans-
ducer. The velocity sensing circuitry is sealed inside the housing
and is not serviceable.
1.6 Software Upgrades
4200 Series Flow Meters can be upgraded without being
returned to the factory or having the EPROM replaced. With
Flash memory, software updates can easily be installed in the
field with a disk, a computer, and a cable. Flash update instruc-
tions can be found in Section 5 Maintenance. For more infor-
mation about installing software upgrades in the 4250 Flow
Meter, contact your Teledyne Isco representative or call the
factory.
1.7 Controls, Indicators,
and Connectors
The controls, indicators, and connectors of the 4250 Flow Meter
are listed in Table 1-1, and their functions are briefly described.
Refer to Figure 1-5 for a view of the connectors and their pin
functions.
1.8 Technical
Specifications
The technical specifications for the 4250 Flow Meter are found in
Tables 1-2, 1-3, and 1-4. The anticipated longevity for a roll of
paper used in the internal plotter is shown for various chart
speeds in Table 1-5.
Note
Various options and accessories used with the 4250 are
described throughout the manual. For convenience, the part
numbers for these items are listed on the Accessory Parts List
found at the back of Appendix A Replacement Parts List. Part
numbers for equipment not listed on this sheet are available
from the factory