Badger Meter SRD/SRI Valve Positioners - Manual (Page 7)

Special Versions of SRD991
SRD991 Stainless Steel Housing
Order with model code SRD991-xxxxxxxx-Zxxx
SRD991 for Very Low Temperature
Version with heating system for temperature down to –60° C
SRD991 for Top Mounting onto Small Actuators
Designed for direct mounting on top of small actuators
without yoke The solution for actuators up to 50 mm stroke
Instead of the rotary potentiometer, a linear pot is used that
feeds back the actual position of the actuator
The Model Code of this basic device is SRD991-…ZZZ…-W
The adapter part is dependent on the manufacturer and type
of actuator and can be ordered under the code EBZG-TMxx
Consult us for the latest list of available adapter parts
SRD991 Designated for PST (Partial Stroke Test for
Emergency Shutdown)
Final control elements in Emergency Shutdown (ESD)
applications such as ON, OFF, Blow Down and Venting
valves remain in one position over a long time without any
mechanical movement These valves can show a tendency
to get stuck and as a result might not operate upon demand
This can have a severe impact on the functionality of a
Safety System and could result in an adverse condition to
the operating personnel, plant equipment and the environ-
ment The Partial Stroke Test (PST) offers operators a tool to
identify the troubleshooting function of ESD valves The test
can be easily executed via the FDT-DTM based configuration
diagnostic tool VALcare/Valve Monitor
SRD991 for actuator with rotation up to 300° This special
version of the SRD991 is designed to be mounted by means
of standard attachment kit (like the EBZG-R) onto rotary
actuator with rotation up to 300° This special version is made
of a standard SRD991 with new gears Order under special
version ECEP EP0256
Description
Page 7 August 2014 POS-UM-00223-EN-02