Toshiba Electromagnetic Flowmeter LF470/LF612 - Manual (Page 2)

TIC-LF470B
2
Model LF470 Detectors
Fluid pressure: -15 to 150 psi, or -1.0 to 10 bar
(-0.1 to 1 MPa)
Principal materials:
Measurement tube – Alumina ceramics
Electrodes – Platinum
Pipe connection port:
Standard – 316 stainless steel
Option – Ti (titanium),
Polyvinyl chloride (shock-resistant)+
Ta (Tantalum) for grounding plate,
Polyvinyl chloride (shock-resistant)+
Pt-Ir grounding plate,
Hastelloy C (Equivalent)
Dedicated preformed cables:
･ Signal cable – 2-wire shielded chloroprene
sheathed cable
Overall length: 0.28 inch (7mm)
Length: 0.20 inch (5m)
Excitation cable – 3-wiren chloroprene sheathed
cable
Overall length: 0.28 inch (7mm)
Length: 0.20 inch (5m)
Coating: phthalic acid resin coating pearl-gray
colored
Weight: approximately 2.2 lb (1.0 kg)
(for each size excluding cables)
Model LF612 converters
Input signals
Analog signal — the voltage signal from detector,
proportional to process flow rate (for LF612
separate type converter).
Digital input DI (opt.)
Signal type: 20 to 30Vdc voltage signal
Input resistance: 2.7k Ω
Number of inputs: one point
DI function — One of the following functions can be
assigned to the optional DI signal.
Range switching — Selects either the higher or lower
range in the unidirectional or bidirectional 2-range
setting.
Totalizer control — Starts and stops the built-in
totalizer.
Fixed-value outputs —Outputs fixed-values for
current and pulse outputs.
Zero adjustment — Executes zero adjustment
(on-stream at zero flow rate).
Output signals
Current output:
4–20mAdc (load resistance 0 to 750 Ω)
Note: The current output cannot be used with the
PROFIBUS-PA communication.
Digital outputs — One point (std.) and one more
point is optionally available as follows.
Digital output DO1 (std.):
Output type: Transistor open collector
Number of outputs: One point
Output capacity: 30Vdc, 200mA maximum
Digital output DO2 (opt.):
Output type:
Solid-state relay output (non polarity)
Number of outputs: One point
Output capacity: 150Vdc, 150mA maximum
or 150Vac (peak to peak), 100mA maximum
DO1 and DO2 functions — One of the following
functions can be assigned to DO1 (std.) and/or
DO2 (opt.)
• Pulse output (available only for DO1, DO2)
Pulse rate: 3.6 to 36,000,000 pulses/hr (DO1)
3.6 to 360,000 pulses/hr (DO2)
(Over 3,600,000 pulses/hr, auto-setting)
Pulse width: 0.5 to 500ms (but less than half of
the period for 100% flow rate)
Note: The same and simultaneous pulse is not
available between DO1 and DO2.)
• Multi-range selection outputs (Note 1)
• High, High high, Low, and/or Low low alarm
outputs (Note 2)
• Empty pipe alarm output
• Digital Output Active Status (DO1 and DO2)
(Note 2)
• Preset count output
• Converter failure alarm output
Note 1: Two outputs (DO1 and DO2) are needed for
4-range switching and forward/reverse 2-range
switching.
Note 2:Normal Open (default set) or Normal Close is
selected for alarm outputs when programming.
When power failure occurs, unit will be fault to
Normal Open.