New concept in remote position sensing
New concept in remote position sensing
Keywords Lucas,Sensors, Transmitters
Schaevitz™ Sensors, a division of Lucas Control Systems, has introduced a totally new concept in remote position sensing with the development of the HCT 420 linear position transmitter.
The HCT 420 is a linear variable differential transformer (LVDT) transmitter with all signal conditioning contained within a 0.75in. (19.1mm) diameter housing. The transmitter is especially suitable for remote process industry applications,such as valve position indication, in which AC power is not readily available to operate line powered signal conditioning.
The transmitter, having a 4-20mA two-wire operating system with loop resistances of up to 700 ‡ at 28V DC, minimizes the effects of changes in loop resistance and electromagnetic interference on position indication. Packaged in a hermetically sealed,stainless steel housing the HCT 420 is designed for the most adverse conditions,able to withstand external pressure of up to 70 bar (1,000 psi) and temperatures from 25°C to 85°C (13°F to 185°F).
Suitable applications include valve position indicating, roller gap control in rolling mills and process industries. The HCT 420 can be used outdoors with long cabling and is ideal for noisy environments.
Options on the HCT 420 include metric thread core, captive core option for convenient installation and a wide range of accessories.
The captive core assembly is a new design, incorporating two Delrin bearings on the core rod, travelling through the stainless steel boreliner. A bronze bearing on the front end utilizes a self-aligning feature to accommodate lateral LVDT movement during operation. The core rod and bearing assembly are field replaceable.
For more information about Schaevitz Sensors' products contact Lucas Control Systems, 543 Ipswich Road,Slough, Berkshire SL1 4EG, UK. Tel: + 44 (0)1753 537622; Fax: + 44 (0)1753 823 563; Web site: http://www.schaevitz.com
