Oval Gear Flowmeter Instruction Sheet
- OG1
- OG2
- OG3
- OG4
- OG5
- OG6
- OG7
- Aluminium
- Stainless steel
- PEEK™
- Flanged or screwed
- Reed switch
- Hall effect.
Electrical characteristics
Hall effect sensors
- 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
- Leakage current: 10uA max.
Reed switch
- Contact material: Rhodium
- Voltage: 24 max
- Current: 100mA max
- Operations: 109
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PD400 Oil Flow Meter and Hours of Operation Counter Instruction Sheet
Titan OG flowmeter installation
The pipe-work should be designed in such a way to eliminate
reverse flow. 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.
In all cases an upstream filter of at least 100 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. 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.
Oval gear flowmeters work by using the low differential pressure
generated across the body to drive a pair of oval gears.
This rotation can be detected by a variety of means to give either
a TTL (NPN transistor) or contact closure pulse output.
The unit is manufactured in a choice of materials and pressure
ratings to suit most applications and as with all positive displacement
flowmeters, the performance improves with increasing
viscosity achieving an accuracy of ±0.1% of reading with
higher viscosities. The standard meters can be used up to 1000
cP, above this viscosity specially profiled gears MUST be used.
Titan OG flowmeter 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. Hall
effect detector (NPN) requires 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. The reed
switch has a protection resistor of 560
Ohms in series with the connections.
Titan OG flowmeter 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 instrument, 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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