EP1000: Electro-Pneumatic Positioner This is an intelligent electro nuematic positioner that conforms to field equipment communication standard HART, which is a world standard. It permits easy and positive digital adjustment of positioner response characteristics and zero and span from a host equipment mounting DDL or from an HHC (Hand Held Communicator). Furthermore, with 3-key calibration executed by a pushbutton built in the positioner, it is possible to set principal items by unit positioner, without need for HHC or the like. It can be mounted to an actuator of any of single action type, double action type, rotary type and linear type, and it operates with a 4-20mA instrumentation signal and compressed air. Therefore, it is a positioner of broad universality, and it is capable of transmitting self-diagnosis information and others besides valve opening and open/close limit signals to a host equipment that conforms to HART. KOSO is now developing FF dealing equipment, which digitalizes up to control signals and conforms to Field bus Foundation Standards.
Single and double acting actuators
4 to 20mA DC (adjustable to 1/4 split range)
500? at 20mA (Input voltage less than 10V)
Linear (Desired characteristic settable)
Non-bleeding type Single acting and double acting types are available
140 to 700kPa
Output air pressure 50%
5Nl/min at 140kPa air supply
15Nl/min at 400kPa air supply
Capacity when output is atmospheric venting
175Nl/min at 140kPa air supply
400Nl/min at 400kPa air supply
For single acting actuator
Linearity : +/-1.0% of FS.
Hysteresis : 0.5% of FS.
Response level : 0.1% of FS.
Repeatability : 0.2% of FS.
For double acting actuator
Linearity : +/-1.5% of FS.
Hysteresis : 0.8% of FS.
Response level : 0.2% of FS.
Repeatability : 0.3% of FS.
The above represents the performance of the positioner on an actuator without a valve. For the performance of the complete unit with a valve and an actuator, see KOSO STANDARD SPECIFICATION.
1 button calibration
Calibration by positioner alone.
with Note PC or Desktop PC
Self diagnosis items
Air supply check/Eath unit's function check/Over load check
Fail position for breakdown selectable
Standard type : -20 to 80o, Explosion type : -20 to 60o
Ambient humidity range
10 to 90% RH
Weather proof type (IP65), Explosion proof type (ExdCT6)
Epoxy resin group paint
Body : Dark green, Cover : Light gray
Available upon request
4 to 20mA 2-Wire type
Power source required in addition to input signal.
Open collector type
Self diagnosis indication
diagnosis result on LED
Separate power supply required