1. General Introduction
A-T Controls SS2 valve positioner come with smart performance with innovative and ever-strong coil drive even under harsh working environments. It supplies main features as bellow:
l Easy and quick auto-calibration
l Detecting RA (reverse acting) or DA (direct acting) automatically regardless of wrong air connections
l Available to use for single or double acting without any special adjustments
l Compact design allowing to be installed on small actuators
l Provide error messages against performance failures
l Possible to test the actuator with any fixed signal under a test mode
l Programmable characteristic curve with 17 points
l Wide operating temperature range -30 to +80℃
l Improved control of high-friction globe and ball valves by eliminating overshoot and hunting
l Low air consumption
l Mounting bracket to meet IEC 60534-6-1 for linear valves
l Support a NAMUR mounting pattern VDI/VDE 3845 (IEC 60534-6-2) and providing a multi-size mounting bracket for rotary valves
l Output position transmitter (4-20 mA) is optional
l 2 x alarm limit or micro switch (SPDT) is optional
2. SS2 valve positioner Specification
Characters | Description |
Input Signal | 4 - 20 mA @ 24 VDC |
Min. / Max. Current | 3.6 mA / 50 mA |
Voltage Drop (Resistance) | Without Hart : 8.7 VDC (435Ω @ 20 mA) With Hart : 9.4 VDC (470Ω @ 20 mA) |
Stroke / Angle | Linear type : 5 - 130 mm Rotary type : 25 - 120° |
Air Supply Pressure | 1.4 - 7.0 bar ( 20 - 100 psi ), filtered, compressed dry and non-oiled to meet Class 3 of ISO 8573-1 |
Output Pressure Range | 0 - 100% of supply air pressure |
Air Capacity | 80 l/min = 4.8 NM3/h = 2.8 scfm (Sup = 20 PSIG) 233 l/min = 14 NM3/h = 8.2 scfm (Sup = 90 PSIG) |
Air Consumption | 2 l/min = 0.12 NM3/h = 0.07 scfm (Sup = 20 ~ 90 PSIG) |
Characteristic | Linearity < ±0.3% F.S Sensitivity < 0.2% F.S Hysteresis < 0.2% F.S Repeatability < 0.2% F.S |
Performance Characteristic | Linear, EQ %, Quick open, User set (17 points) |
LCD Indication | 4-digit LCD indicator |
Adjustable Speed | 1 - 1000 (lowest 1, highest 1000) |
Scan Time | 2ms |
Shut-off Value | Range 0 - 10% of position signal |
Valve Action | direct action (DA) / reverse action (RA) |
Operating Temperature | - 30 to +80°C (- 22 ~ +176°F ) |
Pneumatic Connections | NPT 1/4 |
Electrical Connections | NPT 1/2 |
Protection Class | IP66, intrinsically safe (IECEx / ATEX / KC Exia IIC T5) |
Body Material | Aluminum die-cast / powder-painted |
Weight | 3.5 LBS. |
3. SS2 valve positioner Model selection
Model | Suffix Codes | Description | |||||||||
RSS2 | SS2 valve positioner | ||||||||||
Actuator Operation | L | Linear type | |||||||||
R | Rotary type | ||||||||||
Protection Class | I | Intrinsically safe, ATEX, IECex | |||||||||
K | Intrinsically safe, KCs | ||||||||||
W | Weatherproof to IP66 | ||||||||||
Feedback Lever | A | Stroke (5~30mm) | |||||||||
B | Stroke (5~65mm) | ||||||||||
C | Stroke (5~130mm) | ||||||||||
D | Stroke (80~200mm) | ||||||||||
F | Fork lever | ||||||||||
N | NAMUR shaft (direct mounting) | ||||||||||
Gauge Block | 0 | Not mounted | |||||||||
1 | 6 bar (90 psi) | ||||||||||
2 | 10 bar (150 psi) | ||||||||||
By-pass | N | None | |||||||||
Y | Yes (auto/manual screw) | ||||||||||
Position Feedback | N | None | |||||||||
O | Position transmitter | ||||||||||
L | 2 x alarm limit | ||||||||||
S | 2x micro switch (SPDT) | ||||||||||
M | O + L | ||||||||||
Q | O + S | ||||||||||
Communication (pneumatic - electrical) | N | None | |||||||||
H | HART | ||||||||||
P | Profibus PA | ||||||||||
F | Fieldbus | ||||||||||
Connection | 3 | PT(Rc) 1/4 - PF(G) 1/2 | |||||||||
4 | NPT 1/4 - NPT 1/2 | ||||||||||
5 | PT(Rc) 1/4 - M20 x 1.5 | ||||||||||
Mounting Bracket | N | None | |||||||||
L | IEC 60534-6-1 (for SS2L) | ||||||||||
R | IEC 60534-6-2 (for SS2R) | ||||||||||
Feedback Pin Guide Lever Set | 0 | Not included | |||||||||
1 | Included | ||||||||||
4. SS2 valve positioner front breakup
5. SS2 valve positioner electrical connection
