Teledyne 4220 - Manual (Page 83)

3-1
4220 Flow Meter
Section 3 Installation
3.1 Introduction This section of the manual contains detailed information on the
installation of the 4220 Flow Meter. Included are sections on the
power sources, mounting methods, interconnection wiring,
installation of the submerged probe and setup procedure for the
unit.
3.1.1 Preparation for Use The flow meter is shipped with a roll of paper installed and a
standard program in the system memory, also called the default
program. This program exists to test the flow meter at the
factory, and also because the computer must always have some-
thing programmed into it. You will generally program the flow
meter differently for your installation.
You should familiarize yourself with the programming procedure
and practice working through the program on the flow meter to
become comfortable with programming. You can program the
unit in the shop rather than at the job site, with the exception of
the level adjustment, if you want. This will minimize the possi-
bility of dirt and moisture getting inside the flow meter at the
installation.
3.1.2 Installing the
Desiccant Canister
If the unit is new, at this time you can install the desiccant can-
ister. It is provided in the accessory package and looks like a
small, flat can with little holes in it. Open the flow meter case lid.
Note the small clamp that resembles a bottle cap opener located
near the bottom right-hand corner of the case lid. Install the des-
iccant canister by pressing it under this bracket, with its viewing
window lined up with the circular hole in the bracket.
Make sure the clamp is fully engaged over the canister. The par-
ticles inside the desiccant window should be blue. If the particles
are pink, the desiccant is saturated and you will need to regen-
erate the canister before using it. If the unit has been in use and
has been returned for reprogramming, you should clean it and
inspect it as outlined in Section 6 of this manual. You can also
install the external desiccant cartridge, which provides pressure
equalization for the submerged probe pressure transducer.
3.1.3 Installing the External
Desiccant Cartridge
Snap the external desiccant cartridge into the clamps mounted
on the top of the cabinet. Then attach the silicone tubing between
the top of the desiccant cartridge and the black plastic elbow
fitting mounted on the side of the case near the top.
This desiccator keeps moisture out of the submerged probe's ref-
erence port. This port connects to a tiny tube that goes through
the case and the submerged probe cable all the way to the trans-
ducer. Like the case desiccant canister, the external desiccant