Description
Spirax Sarco self-acting temperature control systems in the SA121, SA122, SA128, and SA1219 series are self-acting control systems comprising a sensor, actuator, and temperature regulator/indicator. They are suitable for 2-way valves (KA, KB, KC, KX, KY, SB, SBRA, BX, BXRA, BM, BMRA, BMF, BMFRA, NS, NSRA) and 3-way valves (TW).
Available Models
| Model | Compatible Valve | Nominal Diameter Range |
|---|---|---|
| SA121 | 2-way valve | DN15 to DN80 |
| SA121 | 3-way valve | DN20 to DN50 |
| SA1219 | 3-way valve | DN80 to DN100 |
| SA128 | 2-way valve | DN15 to DN25 |
| SA128 | 3-way valve | DN20 to DN25 |
| SA122 (temperature regulator located at the valve) | 2-way valve | DN15 to DN25 |
| SA122 (temperature regulator located at the valve) | 3-way valve | DN20 to DN25 |
Optional Accessories
-
Protective pockets available in copper and stainless steel. Wall-mounting bracket.
-
Dial-type regulator and Pt100 temperature sensor. SA122TP includes a built-in protective pocket for installing a PT100 sensor.
Materials of Construction
| Component | Material |
|---|---|
| Sensor | Brass |
| Actuator | Brass |
| Capillary tube | Copper with an external PVC protective coating |
| Regulator | Polypropylene |
| Union | Brass |
| Mounting bracket | Steel |
| Clip | Polypropylene |
| Air duct mounting plate | Steel |
| Protective pocket | Copper (BS 2871 C106), stainless steel (BS 3605 CFS 316S 18) |
| Filling fluid | Kerosene |
Temperature Ranges
| Model | Temperature Range 1 | Temperature Range 2 | Overtemperature Protection | Design Ambient Temperature (Minimum) | Design Ambient Temperature (Maximum) |
|---|---|---|---|---|---|
| SA121 and SA1219 | -15°C to 50°C | 40°C to 105°C | 55°C above set point, maximum up to 190°C | -35°C | +50°C |
| SA122 | -20°C to 120°C | 40°C to 170°C | 55°C above set point | -35°C | +50°C |
| SA128 | -20°C to 110°C | 40°C to 170°C | 55°C above set point, maximum up to 190°C | -35°C | +50°C |
Capillary Tube
Standard lengths are 2m, 4m, and 8m; a maximum length of 16m can be specially ordered.
Weight (Approximate)
| Model | Weight (kg) |
|---|---|
| SA121 | 2.0 |
| SA1219 | 2.3 |
| SA122 | 1.8 |
| SA122TP | 2.0 |
| SA128 | 1.8 |
Additional Accessory Information
-
Union (for direct insertion without a protective pocket): SA121, SA1219, and SA128 correspond to Z, Y, and X; SA122 corresponds to W, V, and U.
-
Protective pocket (for non-direct immersion applications): SA121, SA1219, and SA128 correspond to T, Z, and Y; SA122 is available in copper and stainless steel, corresponding to S, W, and V.
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Long protective pocket (for SA122 only): Special order required. The minimum length is 0.5m, and the maximum length can be specified. Includes the protective pocket, bracket, and rubber plug. Copper and stainless steel options are available, corresponding to S, V, W, T, Z, and Y.
-
Wall-mounting bracket (item 6): Available for SA121, SA1219, SA122, and SA128.
-
Air duct mounting plate: SA121, SA1219, and SA128 include the mounting plate, union, compression ring, and compression nut, corresponding to items 8, X, Y, and Z; not supplied for SA122.
Installation
A detailed installation and maintenance guide is supplied with the product.
Ordering Information
Example: 1 - Spirax Sarco SA121 control system, temperature range 2, with a 2m-long capillary tube and stainless steel protective pocket.