Installation & Operation Manual
ECON actuator Fig. 7917EX, type ELSA50 – 260
www.eriks.com
Rev. 0 – April 10
th
, 2019
6
2. Product Overview
ECON Fig. 7917EX ELSA series explosion-proof spring return fail-safe actuators are
designed and manufactured as flame-proof and combustible dust-proof products.
ECON ELSA series spring return fail-safe electric actuators offer torque ranges from 50 Nm
up to 260 Nm (445 in-lb to 2300 in-lb) and are designed for fail-safe positioning of quarter-
turn valves or dampers upon loss of supply voltage, which include On/Off control, floating
control and modulating control.
A rack and pinion spring mechanism is used to position the
controlled device to either fully OPEN or fully CLOSED position without any external power
source. For On/Off types, a mechanical BUFFER is used at the end of the spring stroke to
reduce the “water hammer” effects in pipes. A clutch-less manual override is provided for
manual positioning of the controlled device. Actuators without a manual override can be
ordered as an option.
ATEX / IECEx Explosion-proof instructions
II 2 G Ex db IIB T4 Gb
II 2 D
Ex tb IIIC T130°C Db
Fig. 7917EX ELSA series Explosion-Proof Spring Return Fail-safe Electric
Valve Actuator (referred as "actuator"). It is a control device for valves and can
be used in the places, where is classified as Zone 1 or Zone 2, contained Group
II A and Group II B gases, Zone 21 or Zone 22, contained the combustible dust
atmosphere or the mixture circumstance with the explosive gas atmospheres
and the combustible dust atmospheres. Temperature group T1 - T4.
Certificate Numbers:
Sira 19 ATEX 1176 X
IECEx SIR19.0043X
2.1 Features
IP68 enclosure (7m/72 hours).
Controls: On/Off, floating (optional), modulating (optional).
Clutch-less manual override.
ISO 5211 mounting flange.
Domed visual position indicator.
Built-in motor thermal protection