ISO 9001 : 2000

Certificate: 04100 1994 0422

Pneumatic /
Electro Pneumatic Positioner
820-PP/830-WP/831-WP/830-EX/831-EX

Specialists in Process Efficiency and Energy Conservation

Positioners improve the control accuracy of valve body Silent Features :
considerably. Friction in the stuffing box and reactions Works on the force-balance principle
?
of the medium cause deviations of the valve position.
Split range of operation is possible
?
These are balanced out by the positioner.
Short response time: lesser moving parts
?
Positioners acts as an amplifier for boosted output
signal to the actuator. Vibration proof: Valves are constantly exposed to
?
vibrations. Forbes Marshall Positioners are robust and
operate even under most difficult conditions

NOMENCLATURE
N O M E N C L A T U R E

Pneumatic Weather Proof 820-

PP
Pneumatic with Feedback 821-
PP
Pneumatic with Limit Switch 822-
PP
Electro Pneumatic W/
P 830-
WP
Electro pneumatic with feed back - 831-WP 831-
WP
Electro Pneumatic with Limit Switch 832-
WP
Electro Pneumatic Ex.Proof 830-
EX
Electro Pneumatic Ex proof with feed back - 831-EX 831-
EX
Eelctro pneumaitc Ex proof with Limit Switch : 832-EX. 832-
EX

TECHNICAL DATA
T E C H N I C A L D A T A

Type 820-PP Pneumatic 830-WP Electro Pneumatic

Input 0.2 - 1Bar 4-20mA
Working resistance ------ Approx -200ohms
Impedence ------ 250+/- 15 OHM
Supply Pressure 1.4-6 kg/cm2 1.4-6 kg/cm2
Air consumption 3 lpm at 1.4 Bar 3 lpm at 1.4 Bar
Air flow capacity 80lpm at 1.4 Bar 80 lpm at 1.4 Bar
Linearity +/- 1% of F.S +/- 1% of F.S
Hyserisis +/- 1% of F.S +/- 1% of F.S
Repeatability +/- 0.5% +/- 0.5% of F.S
Air connection ¼" NPT(F) ¼" NPT(F)
Gauge connection 1/8" NPT(F) 1/8"NPT(F)
Ambient Temp -20 Deg.c to + 70 Deg.c -20 Deg cto + 70 Deg.c
Protection IP 66 IP 66
Weight 2.2 Kg 2.8 Kg
Exproof ------ IIB & IIC
Electric Connection ------ G 1/2 (PF ½)

Subject to change without notice

Forbes Marshall Arca Pvt. Ltd.

A-34/35, H Block ,MIDC ,Pimpri ,Pune- 411018 . India. Tel: 91(0)20 - 27442020 Fax: 91(0)20 - 27442040
Email: vsales@forbesmarshall.com
Branches:
Ahmedabad, Alibag, Bangalore, Chennai, Chandigarh, Coimbatore, Delhi, Hyderabad, Jamshedpur, Kolkata,
Mumbai, Nagpur, Navi Mumbai, Surat, Vadodara, Visakhapatnam
Area Representatives:
Bhopal Indore Madurai Pondicherry
International Offices:
USA Bangladesh Indonesia Kenya Sri Lanka Thailand Iran Nepal Turkey U.A.E. Canada Malaysia www.forbesmarshall.com