This single-channel system uses microprocessor-based control and comes completely pre-wired and assembled, with a variety of options that include three different AC line voltages (120, 240 and 277), RS-485 communications interface, and Ground Fault Indicator.
Its programmed standard features include three control modes: ON/OFF, PID and SMART tuning. The temperature alarm can be programmed for process deviation, band, high/low and latching/non-latching (manual or automatic reset). The low current alarm can be set from 0 to 30 A in 1 A increments. The optional GFI alarm trip can be adjusted over a range from 5 mA to 100 mA. The dual digital display can be programmed for either ºC or ºF.
These systems are designed for universal inputs, including types J, K, L, N, R and S thermocouples, RTDs, current and voltage. Each unit comes in a NEMA 4X glass fiber reinforced enclosure (12.5"H x 10.5"W x 6"D) that includes a solid-state relay with 30 A rating at 40ºC, mounted on a heatsink, and a current transformer to measure operating current. The optional GFI modules have a shutdown contactor and illuminated reset switch. A terminal block is used for field connections on all units.
Chromalox Precision Heat and Control, 701 Alpha Drive, Pittsburgh, PA 15238. Tel: 412-967-3803; Fax: 412-967-5148.