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ARi can supply multiple element assemblies, also known as multipoint thermocouple, small enough to replace single point thermocouples. We also manufacture large multiple element assemblies which can replace expensive thermowells. It is now possible to insert a multilevel thermocouple assembly directly into a pressurized process chamber with minimum flow restriction and a response time that is measured in seconds. This fast response time will allow detection of abnormal process temperature conditions before damage can occur.
Multiple level temperature sensors (Multipoint Thermocouple) have junctions space to provide continuous temperature profiles. The sensing end of the thermocouple assembly may be formed or bent around offsets and the assembly can withstand the following external pressures:0.125″ — 3000psig and 0.500″ — 4000psig.
Available in the following calibration types:
-300 to 1000
32 to 1800
-400 to 1800
MULTI-LEVEL THERMOCOUPLE | ||||||
|---|---|---|---|---|---|---|
| Style | T-50656 | T-50657 & T-50780 | T-50809 | |||
| Outer Diameter | 0.125″ ± 0.002″ | 0.500″ ± 0.005″ | 0.125″ ± 0.002″ | 0.500″ ± 0.005″ | 0.125″ ± 0.002″ | 0.500″ ± 0.005″ |
| Transition Section | ½” NPT Nipple x 4″ Long | ½” NPT Nipple x 4″ Long | ½” NPT Nipple x 4″ Long | ½” NPT Nipple x 4″ Long | ½” NPT Nipple x 4″ Long | ½” NPT Nipple x 4″ Long |
| Length Range (L) | 6″ to 240″ ± 1″ Tolerance | 12″ to 240″ ± 1″ Tolerance | 6″ to 240″ ± 1″ Tolerance | 12″ to 240″ ± 1″ Tolerance | 6″ to 240″ ± 1″ Tolerance | 12″ to 240″ ± 1″ Tolerance |
| Max Pressure at 100 °F | 3000 psig | 4000 psig | 3000 psig | 4000 psig | 3000 psig | 4000 psig |
| Time Constant at 3 MPS Water Velocity (grounded junction) | 3 sec. | 10 sec. | 3 sec. | 10 sec. | 3 sec. | 10 sec. |
| Weight per Unit Length | 0.3 lb/ft | 0.45 lb/ft | 0.3 lb/ft | 0.45 lb/ft | 0.3 lb/ft | 0.45 lb/ft |
| Minimum Bend Radius for (L) Section to Avoid Permanent Set | 0.5″ | 12″ | 0.5″ | 12″ | 0.5″ | 12″ |
| Number of Points Available | 2 to 4 | 2 to 7 | 2 to 4 | 2 to 6 | 2 to 3 | 2 to 3 |
Notes:
Calibration And Sheath Materials | |||||
|---|---|---|---|---|---|
| Calibration Type | Outer Sheath Materials | ||||
| Wire Type | Temp Range °F | Temp Range °C | Sheath Type | ARi Symbol | Maximum Temp °F |
| J | -300 to 1000 | -184 to 540 | 304 ST/ST | A | 1600 |
| K | 32 to 1800 | 240 to 980 | Inconel 600* | B | 1800 |
| E | -400 to 1800 | -240 to 980 | 316 ST/ST | C | 1600 |
| 347 ST/ST | F | 1600 | |||
