Atec Micronics-PF220 - Manual (Page 5)

Portaflow 220 Technical Datasheet
Portaflow 220 Technical Datasheet 5
(Issue 1.0)
Transducers
The PF220 system is supplied with one set of transducers with a temperature operating range of -20°C to +135°C . The PF220A is
supplied with type ‘A-ST’ tranducers and the PF220B is supplied with type ‘B-ST’.
Transducer mounting
Type ‘A’ & ‘B’ transducers are fitted to adjustable guide rails
which are secured to the pipe using wrap-around chains and
mechanically connected together by a steel separation bar. The
separation bar also acts as a ruler to allow the distance between
the transducers to be set to the value calculated by the
Portaflow instrument.
A thumb-wheel is used to adjust the chain tension until the
assembly is held firmly in place. The transducers are then
inserted into the guide rails and secured in place by a knurled
screw. This illustration shows a completed assembly with a
transducer fitted to the left-hand guide rail only.
The transducers are connected to the PF220 instrument by
means of two 2m mini-coaxial cable.
Control Outputs
PF220A standard transducers: PF220B standard transducers:
• 'A-ST' (2MHz) – used with 13mm 115mm pipe o.d. • 'B-ST' (1MHz) – used with 50mm 1000mm pipe o.d.
The PF220 provides analogue and pulse outputs that are
designed to be used in conjunction with external control and
site monitoring applications such as those typically found in
building management systems. These outputs can be
calibrated to suit a required flow operating range and a high-
flow alarm level.
Both outputs are connected to a single (green), 7-pin LEMO
socket located on the top of the PF220 instrument. A single
2 metre cable is provided that can be adapted for use for
either of these output functions. The ‘tails’ on the free end of
the cable must be terminated to suit the intended application
Cable termination
Red –
Black –
White –
Green –
Brown –
Blue –
Thick Black – 4-20mA positive
4-20mA negative
Pulse output (+)
Pulse return (-)
Set Point (not in present use)
Set Point return (not in present use)
Cable screen
Analogue output: Pulse output:
Range – 4–20mA
0–20mA
0–16mA Output type – One open collector opto-isolated digital
output
Resolution – 0.1% of full scale Pulse repetition – Up to 500 pulses/sec (depending on
pulse width)
Alarm current – Adjustable between 0–26mA Pulse width – 500ms for 1pulse/s
5ms for 100 pulses/s
Isolation – 1500V Opto-isolated Max current – 150mA
Maximum load – 620 Ohms