Oct 1, 2012 7:00 AM

Controlling temperature-sensitive cargo is essential in allowing consumers worldwide to receive fresh produce, frozen foods, and other perishable chilled items any time of year.

Selco Products recently met the temperature control requirements for an original equipment manufacturer (OEM) building reefers (refrigerated containers) for truck transport. While specific to the refrigerated truck application, the resulting refrigeration control system can be used in various climate-controlled transport applications such as trailers, rail, and air.

Key to the product’s design specifications was a thermostat that provided drop-in-place installation and handled the required switch capacity. Selco’s WK, WK-H, and WP Thermostat Series complete with mounting hardware supplied the answer. Additionally, Selco’s fast sample turnaround time and engineering support through ISO9001/AS9100 processes were equally important.

WK, WK-H, and WP cold capillary thermostats offer accurate temperature control, smooth adjusting, and high reliability. These devices are mechanical switches activated by temperature change in the capillary tube sensor. The sensor is charged with a special refrigerant gas, and the change is converted to travel via the bellows/diaphragm, which is actuated by the mechanical level switch closing on temperature rise. The devices can be used as temperature or defrost control elements with or without constant cut-in.

Specific performance capabilities include operating temperatures of 0º–40º C (WK Series), –35º to 40º C (WK-H Series), and –30º to 55º C (WP Series). Amperage capacities vary between models with the WK-H Series featuring the higher amperage of 25A. All three thermostat models are available with or without forced “off” and forced “on” positions and with single-pole, single-throw (SPST) or single-pole, double-throw (SPDT) switching contacts.

WK, WK-H and WP thermostats are offered with a variety of bracket, terminal, and adjustment shaft hardware options to accommodate a range of user requirements.

For further information, visit www.selcoproducts.com.