Mini flow turbine meter Instruction Sheet
- 800 Series
- 900 Series
- 1000 Series
- Mini turbines
- ˝” Mini turbines
- Optical detection
- Hall effect detection
All meters do not look the same, this illustration is an amalgam and is for guidance only.
Mini flow turbine meter: Pressure drop Vs flow rate for model suffix number
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Titan Flowmeters: Mini flow turbine meter: Installation
The pipe work must be designed in such a way to eliminate reverse flow, and
the flow passes through the meter in the direction of the arrow. The meter
should be installed in a position that prevents it from draining down as on
start-up serious damage could result by “impacting” an empty flowmeter with
a high velocity fluid stream. The fluid should be clean and homogenous and
in the case of optical detection, be able to transmit infra-red light. In all cases
an upstream filter of at least 80 microns must be fitted. It is recommended
that before the flowmeter is installed in the line a “dummy” section of
pipe is inserted and the system flushed. This is to eliminate any debris in
that section of the line. The pipe must not stress the body of the meter and
should be fully supported either side with appropriate isolation valves and in
some cases a by-pass valve. When screwing fittings into a threaded body always
place the second spanner next to the fitting being inserted, never
tighten one fitting against the other across the meter body as this will distort
thr body and damage the sapphire bearings. On initial start-up increase the
flow slowly to ensure no over speeding of the meter occurs as the air is
forced from the line. This is best achieved by monitoring the flow rate and ensuring
that a 50% over-range is not exceeded. Never blow a flowmeter with
an airline. Care should be taken to ensure that no air enters the system (e.g.
leaky pump gland) or that no cavitation takes place. With a volatile liquid we
recommend at least twice the vapour pressure plus 1 Bar as the operating
pressure. The user must ensure that the materials of construction are compatible
with their fluid. We accept no responsibility for material compatibility,
it is the users responsibility.
The principle of operation is very simple. A jet of liquid is directed
at a free running Pelton wheel turbine in a specially
shaped chamber. The rotation of the rotor is detected either
optically or with a Hall effect sensor. The output frequency
of these pulses is directly proportional to flow rate and the
total number of pulses the total volume passed. The sta ndard
bearing material is sapphire as this gives a long trouble
free life to the meter. Non-metallic options mean that these
meters may be used with very aggressive chemicals and
ultra-pure water.
Titan Flowmeters: Mini flow turbine meter electrical
It is recommended that all “signal” cables
are screened and run separately
to power lines and switched inductive
loads and are located well away from
inverters and other “noisy” apparatus.
Always use sound wiring practice.
Both Hall effect and optical detectors
(NPN) require an external pull-up resistor
connected between the output
and a suitable power supply to attain
a pulse. Typically the flowmeter PSU
may be used but sometimes a dc
pulse, which is of a different voltage,
may be required e.g. using a PLC with
a 24V PSU and an internal 5V rail for
the pull-up resistor/pulse input.
Titan Flowmeters: Mini flow turbine meter: Electrical characteristics
Titan Flowmeters: Mini flow turbine meter: Hall effect sensor
Supply voltage 4.5-24Vdc
Temp range -40 to150°C
Rise & fall times 1.5uS max
Supply current 7.5mA typ.
Switch current 10mA max
Titan Flowmeters: Mini flow turbine meter: Optical detector
Supply voltage 7.5 - 24Vdc
Rise time 1.5uS max
Switch Voltage 24 max
Switch current 20mA max
Supply current 25mA max
Titan Flowmeters: Mini flow turbine meter commissioning
If problems occur during commissioning always check the fundamentals
first.
- Is the flowmeter/instrument the correct one for the
installation?
- Is the power connected to the meter and the instru
ment, and is it turned on?
- Is the instrument set/wired correctly? I/P port, pulse
type, frequency span, units etc.
- Where possible check the O/P from the flowmeter
with an oscilloscope before proceeding
- Was the line flushed prior to installing the meter?
- Was the flow increased slowly?
- Is the meter blocked?
If you cannot find a solution ask your supplier for technical support.
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