Delta 8000SAN User Manual

INSTALLATION, OPERATING AND

SUPPLY VOLTAGE

REQUIRED

26

COVER

FM 720

ISO 9001

Series 8000 Pressure Transmitters
employ a piezo-resistive sensor operated
from a flush diaphragm specially
designed for paper, food and drugs
industries where viscous and/or
biologically active fluids are encountered.

A monolithic amplifier provides a 4-20 mA
current output capable of being used in
control and indicating loops without
further application.

The instruments are adjustable for zero
and span: the span adjustment having
sufficient turn down to enable all
intermediate ranges to be
accommodated.

INSTALLATION

Ensure that the pressure range and
maximum working pressures selected are
compatible with the expected pressures in
the system. While the instruments are fully
calibrated in the works, it is advisable to
check zero and span before installation, if
possible with the instruments in the attitude
in which they are to be mounted.

As these instruments are designed for direct
contact with the process medium their
sophisticated temperature compensation
enables accurate operation over a wide
range of temperatures. Care should be
taken however during cleaning processes.

Processes, that the maximum permissible
temperatures are not exceeded. An
addendum to these instructions gives hints
for installation and cleaning-in-situ.

The instrument may be mounted in any
position and is normally self supporting by
the pipework.

While the instruments have high resistance
to EM and RF interference, it is strongly
recommended that for long cable runs, the
instrument leads be screened.

VOLTAGE v LOAD

Voltage must be within triangular area

45

40

35

30

25

20

15

10

2000 400 600 800 1000 1200 1400

As supplied

Without 100 ohm
internal resistor

EXTERNAL LOAD OHM

RIGHT

WRONG

In the interest of development and improvement Delta Controls Ltd, reserve the right to amend without notice, details contained in this publication.

DELTA CONTROLS LIMITED, ISLAND FARM AVENUE, WEST MOLESEY, SURREY KT8 2UZ
TEL. [phone] FAX. [phone] E-MAIL:[e-mail]

Registered Office Registered in England No 486464

MAINTENANCE INSTRUCTIONS

FOR SERIES 8000 AND 8000SAN

FLOW TRANSMITTERS

ISSUE B 04/00

OUPUT SIGNAL

The transmitters use the standard 4 to 20
mA two wire system in which the power
supply, transmitter and load are in series.
This means therefore, that for a constant
voltage at the power supply, as the signal
level rises, the drop across the load reduces
the voltage available at the transmitter. This
voltage should at all times be within the
range 13 to 40 V and the attached load /
voltage diagram shows the permitted range
of supply voltage for the satisfactory
operation of the instrument.

ADJUSTMENT

Zero and span controls are accessible by
removal of the threaded lid. Disconnection
of the electrical wiring is not necessary for
the functioning of the instrument, but proper
site practices should be followed when
working on the instrument which is ‘live’ with
respect to power or process.

MAINTENANCE

No maintenance is normally necessary or
required on these instruments.

Should the cover be removed for adjustment,
ensure that the O-ring seal is not damaged.
Light greasing is recommended.

Fig 1

WRONG

Fig 2

No legal liability will be accepted by Delta Controls Ltd, for any errors, omissions or amendments.

RIGHT

WRONG

INSTRUMENTATION SOLUTIONS FOR INDUSTRY

HINTS ON INSTALLATION

The mounting position of the level transmitter
in a tank is important; incorrect positioning
may lead to inaccuracies, particularly during
filling or discharging.

In general, the unit should avoid inlets and
outlets, and be protected against direct
impact from cleaning jets.

The installer should also avoid mounting
directly upstream or rapidly closing valves,
which may create shock waves in excess of
the instrument’s over-range capability.

Piston pumps and homogenizers also create
pressure fluctuations which may damage or
shorten the life of the units.

WELDING INSTRUCTIONS

The fitting of Delta type 8000 level/pressure
transmitters with mounting ‘W’, requires that
the mating part be welded to the tank or pipe
of the process plant.

NB These instructions also apply for the
fitting of 1:1 repeaters which use the same
fittings.

The units may have, according to the model,
a push-in nipple secured by a side bolt, or, in
the case of the hygiene units, a fine thread
and lockring.
It is very important that during the welding
operation, no deformation of the push-fit
boss or the M56 x 1.25 thread should take
place. The following procedure minimises
this possibility.

1. Cut a close fitting hole for the nipple in the
pipe or tank. Bevel the inside of that hole.

2. Attach copper/aluminium mandrel to the
weld nipple with the bolt or lockring provided.

3. Using MIG techniques and a fine
electrode, weld the nipple in place.

DO NOT ATTEMPT THE COMPLETED
WELD IN A SINGLE OPERATION.

First weld two spots opposite to each other
and allow to cool. Next weld two more spots
at right angles to the first and allow to cool.
Complete the weld, welding opposite
quadrants.

WRONG

Fig 3

103

RIGHT

Fig 4

WARRANTY

We guarantee this instrument against faulty
workmanship and material for a period of
one year from the date of delivery. The
company undertakes to repair, free of
charge, ex-works any instrument found to be
defective within the specified period provided
the instrument has been used within the
specification in accordance with these
instructions and has not been misused in
any way. Detailed notice of such defects
and satisfactory proof thereof must be given
to the company immediately after the
discovery and the goods have to be returned
free of charge to the company, carefully
packed and accompanied by a detailed
failure report.

To comply with health and safety
requirements, the instrument must be clean
and safe to handle and accompanied by a
formal statement

ł

65

22

ł

33

16

O-RING
PG9 CABLE GLAND
VENT
COOLING FINS
SECONDARY O –RING
M8 SCREW
O-RING SEAL
WELD NIPPLE
DIAPHRAGM

Stock No: 002522/8000

Fig 5