Spring-loaded inserts and separate protective tubes
The 240 and 442 configurations use a sheathed measuring insert held against the protective-tube tip by a spring. The insert and protective tube can be separated for service. Aluminum-alloy flameproof heads are offered with listed ExdIIBT1-T5 or ExdIICT1-T6 markings; select the required head and temperature class for the installation.
Thermocouple material and range choices
| Sensor type |
Element |
Insert sheath |
Protective tube |
Operating range |
Accuracy |
| Nickel-chromium / nickel-silicon |
K |
06Cr18Ni11Ti |
06Cr18Ni11Ti |
-40-800°C |
I: ±1.5°C or ±0.4%|t|; II: ±2.5°C or ±0.75%|t| |
| GH30 alloy |
1Cr25Ni20 |
0-1000°C |
I or II, same K tolerance expressions |
| GH30 alloy |
0-1100°C |
| 3YC-52 alloy |
0-1200°C |
| Nickel-chromium / copper-nickel |
E |
06Cr18Ni11Ti |
06Cr18Ni11Ti |
Single: 0-650°C; dual: 0-550°C |
I: ±1.5°C or ±0.4%|t|; II: ±2.5°C or ±0.75%|t| |
| Iron / copper-nickel |
J |
Single: 0-600°C; dual: 0-540°C |
| Copper / copper-nickel |
T |
-200-350°C |
I: ±0.5°C or ±0.4%|t|; II: ±1°C or ±0.75%|t| |
RTD selections
| Sensor type |
Element |
Insert sheath |
Protective tube |
Range and tolerance |
| Platinum RTD |
Pt100 |
06Cr18Ni11Ti |
06Cr18Ni11Ti |
-200-420°C; A: ±(0.15+0.002|t|)°C |
| 0-500°C; B: ±(0.30+0.005|t|)°C |
| 3YC-52 alloy |
0-650°C; B: ±(0.30+0.005|t|)°C |
| Copper RTD |
Cu50 or Cu100 |
06Cr18Ni11Ti |
-50-100°C; ±(0.30+0.006|t|)°C |
Mounting and insertion depth
| Mount |
Protective tube and tip |
Nominal pressure |
Insertion options |
| Fixed threaded taper |
Solid drilled, tapered |
30MPa |
150-1000mm or 75-1000mm |
| Fixed flanged taper |
Determined by flange form |
| Fixed thread |
Solid drilled, straight |
10MPa |
150-1000mm |
| 16mm welded tube, straight or reduced tip |
150-2000mm |
| Fixed flange |
Solid drilled, straight |
Determined by flange form |
150-1000mm |
| 16mm welded tube, straight or reduced tip |
150-2000mm |
| No fixed mounting or sliding flange |
Atmospheric pressure |
The fixed threaded tapered-tube configuration may be used at 80m/s media velocity when insertion is no greater than 250mm. Solid drilled-tube insertion can be specified within the applicable range.
