1. General Introduction
SRD991 valve positioner is Intrinsic Safety EEx ia version type work with pneumatic control valve actuators and compatible for any control systems. It is available with different communication protocols, includes analog setpoint (4 to 20 mA), HART, Profibus and FOUNDATION fieldbus. All the diagnostics features can be easily configured and displayed by the Positioner DTM (Valve Monitor). Moreover, the Positioner DTM enables editing a complete “health” report of the valve with all configuration and diagnostics data. The SRD991 also has the capability to control a Partial Stroke Test (PST) that offers operators a tool to identify the trouble-proof function of ESD(Emergency Shut Down) valves.
SRD991 valve positioner also supports stroke range 8 to 260 mm (0.3 to 10.2 in), angle range up to 95°, Supply air pressure up to 6 bar (90 psig), both single or double acting available. It's suitable for liner and rotary actuators with Self-diagnostic, status and diagnostic messages and suitable for safety applications up to SIL 3. Moreover, Additional Inputs/outputs are optional, including:2 binary outputs (limits); Position feedback 4 to 20mA, 1 Alarm output; 2 binary inputs; Built-in independent inductive limit switches(2- 3-wire) or micro switches; sensors for supply air pressure and output pressure; binary Inputs/Outputs dedicated to SIS logic solvers and etc.
2. Selection table of SRD991 valve positioner
Main Code | Suffix Codes | Description | |||||||
SRD991 | SRD991 Intelligent Positioner | ||||||||
Version | B | Single Acting | |||||||
C | Double Acting | ||||||||
Input/Communication | D | Intelligent without communication (4 - 20mA) | |||||||
H | HART Communication (4 - 20mA) | ||||||||
P | PROFIBUS-PA | ||||||||
Q | FOUNDATION Fieldbus H1 | ||||||||
Additional Inputs/Outputs | N | Prepared For Additional In-/Outputs | |||||||
P | Two Binary Outputs | ||||||||
F | Position Feedback 4 - 20mA and one binary output for alarm | ||||||||
B | Binary Inputs | ||||||||
E | Binary Inputs-Outputs (mandatory for ESD application) | ||||||||
Built-In Limit Switch | S | Without Built-In Limit Switch | |||||||
T | Inductive Limit Switch — Intrinsically Safe (Standard Version SJ2-N) | ||||||||
U | Inductive Limit Switch — Intrinsically Safe (Security Version SJ2-SN) | ||||||||
R | Inductive Limit Switch — Three wire version | ||||||||
V | Mechanical Switches (Micro-Switches) | ||||||||
D | Potentiometer Input | ||||||||
Cable Entry | 1 | M20 x 1.5 Without cable gland | |||||||
6 | 1⁄2”-14 NPT (with adapter(s) M20 x 1.5 to 1⁄2”-14 NPT) | ||||||||
7 | M20 x 1.5 With one plastic cable gland | ||||||||
Electrical Classification | ZZZ | Without | |||||||
EA4 | ATEX EEx ia IIC T4 | ||||||||
EAA | ATEX II 2 G EEx ia IIC T6 | ||||||||
ED4 | ATEX II 2 G EEx ia IIC T4 + Zone 20 Dust | ||||||||
EDA | ATEX II 2 G EEx ia IIC T6 + Zone 20 Dust | ||||||||
NFM | FM Nonincendive For Class I, Division 2, Groups A, B, C, D | ||||||||
FAA | FM Intrinsic Safety Class I, Division 1, Groups A, B, C, D | ||||||||
CAA | CS A Intrinsic Safety Class I, Division 1, Groups A, B, C, D | ||||||||
GA4 | GOST Intrinsic Safety Exia II CT4 | ||||||||
GAA | GOST Approved for Intrinsic Safety Exia II CT6..T4 | ||||||||
Attachment Kit | N | Order as Auxiliary | |||||||
Manifold | S | Pneumatic connection 1⁄4–18 NPT | |||||||
L | Pneumatic connection G1/4 | ||||||||
Optional codes | Optional codes | ||||||||
3. Typical mounting of SRD991 to liner actuators
4. Typical mounting of SRD991 to rotary actuators
