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Product Name Electro-Pneumatic Positioner
Model EP1000
Series Accessories
Product Description

▶ EP1000 : Electro-Pneumatic-Positioner

This is an intelligent electropneumatic 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 Fieldbus Foundation Standards.




Applicable Actuators

Single and double acting actuators

Input Signal

4 to 20mA DC (adjustable to 1/4 split range)

Power supply

2-Wire type

Input impedance

500Ω at 20mA (Input voltage less than 10V)


Linear (Desired characteristic settable)

Pilot valve

Non-bleeding type

Single acting and double acting types are available

Air supply

140 to 700kPa

Air consumption

Output air pressure 50%

5Nl/min at 140kPa air supply

15Nl/min at 400kPa air supply

Max. capacity

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.

Own program

with Note PC or Disktop PC

Self diagnosis items

Air supply check/Eath unit's function check/Over load check

Fail position for breakdown selectable

Air connection

Rc 1/4

wiring connection

G 1/2

Ambient temperature

Standard type : -20 to 80°, Explosion type : -20 to 60°

Ambient humidity range

10 to 90% RH


Weather proof type (IP65), Explosion proof type (ExdCT6)

Standard anicillary

Auto-Manual change

Housing material

Aluminum alloy


Epoxy resin group paint

Coating colors

Body : Dark green, Cover : Light gray

Apporox. Weight


Optional specifications

Available upon request

Position transmitter

4 to 20mA 2-Wire type

Power source required in addition to input signal.

Limit switches


Open collector type

Self diagnosis indication

diagnosis result on LED

Separate power supply required

wiring connection

1/2 NPT

Air connection

1/4 NPT

Products of KOREA KOSO