This document introduces the characteristics and features of Barksdale's local mount temperature switches.
Barksdale temperature switch products include local mount and remote bulb and capillary models. Local mount switches are installed in the pipe or vessel, while remote models allow the switch enclosure to be placed up to 25 feet from the media. The products are offered in housed, NEMA 4 and/or explosion proof designs with one or two adjustable temperature set points and fixed or adjustable differential.
An ambient compensation device cancels adverse effects of ambient fluctuation; bulb and capillary configurations maintain ±1% of full-scale accuracy in the mid-60% of the adjustable range under extreme ambient changes from -65°F to +165°F, and ±0.5% full scale at constant ambient. The guide also covers differential by switch class, hermetically sealed switches for hostile environments, and AC/DC electrical ratings for models such as MT1H, T2H, T1X, T2X, ML1H, L2H and L1X.
| Ambient compensation range | -65°F to +165°F |
|---|---|
| Accuracy in mid-60% of adjustable range | ±1% of full-scale |
| Accuracy at constant ambient | ±0.5% full scale |
| Remote enclosure distance | Up to 25 feet |
| Standard capillary lengths | 6 and 12 feet |
| Extra capillary lengths | Up to 25 feet |
| Local mount pressure rating | Through 300 PSI |
| Available designs | Housed, NEMA 4 and/or explosion proof |
| Temperature set points | One or two adjustable |
| Differential | Fixed or adjustable |
| Watertight rating | NEMA 4 and 13 |
| Explosion proof rating | NEMA 7 and 9 |
| Hermetically sealed hazardous area | Class I, Division II |
Up to 25 feet.
No; all filling fluid is exposed to the media temperature, so there is no ambient temperature influence on the filling fluid.
±0.5% full scale.
Class I, Division II hazardous areas.