     |
|
HNL INSTRUMENTS & CONTROLS
Series 980 Linear Positioner
Specification and options Download pdf datasheet(251K)
The graphic above shows
a Series 980 Positioner on a double-acting cylinder. The
arrangement is direct acting (as described below) due to the feedback
cam profile. The feedback cam is rigidly clamped to the piston rod with
a ‘link arm’.
HNL’s Series 980 pneumatic positioner
may be used to control the travel of the piston rod on double-acting or
single-acting cylinders. A control signal of typically 0.2 to 1.0 bar
provides proportional movement of the piston rod.
By changing the profile of the feedback cam and the way the actuator is
piped to the positioner, a direct acting or reverse acting
configuration may be achieved. With direct acting the piston rod moves
out for a rising control signal, with reverse acting the piston rod
moves in for a rising control signal.
In addition to providing a high degree of reliability, the positioner
has the advantage of being able to operate with supply pressures up to
10 bar.
All external linkage components are of stainless steel. The positioner
body is available in anodised aluminium or 316 stainless steel. The
standard control signal for the positioner is 0.2 to 1.0 bar (3-15
psi). Both the zero and span adjustments are readily accessible
allowing for on-site calibration.
The optimum cylinder size for the standard positioner is a bore of
150mm and a stroke of 300mm. Where the stroke or bore is significantly
larger than this the speed of operation will be slower. A high gain
positioner is available for these applications.
The Series 980 positioner can be supplied on its own, or with a link
arm and stainless steel feedback cam for a specified actuator.
Alternatively HNL will undertake the fitting, piping, calibrating and
testing of positioners to all suitable cylinders and actuators.
BACK
HAMALL PROCESS INSTRUMENTS, DEVONPARK MILLS, ALEXANDRA STREET, TILLICOULTRY, CLACKMANNANSHIRE, SCOTLAND, UK. FK13 6HP
TEL NO : 44 (0)1259 753753 FAX NO : 44 (0)1259 752770
 sales@hamall.co.uk |
