Faced with the dilemma of how to connect multiple displays to their new generation T600 line of tachometers, JAQUET engineers turned to Bluetooth technology to provide the solution.

The T600 base model provides 2 frequency, 1 analogue and 2 binary inputs. The output control functions comprising of 2 analogues, 4 relays and 2 open collectors are then defined using resident configuration software. Output functions may either be simple relationships to inputs such as 4…20mA = 500…1500Hz, or complex System Limit operations such as Relay 1 Open at Frequency Input A Limit 1 OR Frequency Input B Limit 2 OR Analogue input Limit 3 (Fail Safe). A typical application for this feature is protecting a machine from running too fast or too hot through a single shutdown command.

An Ethernet interface is provided for configuration and device interrogation, with a CANbus connection to provide status information to a master controller.

An integral event recorder time and date stamps when binary inputs are received, limits are exceeded and trip outputs generated. A data-logger is provided so that data leading up to and following a trip can be recovered for subsequent incident analysis.

Given the amount of data that could be created, it was decided that providing only one display would be a limiting factor. After connecting a compact Bluetooth base module, up to 7 displays may then be operated, each showing different data if required. So display 1 might provide the ratio between 2 speed inputs whilst displays 2 and 3 show the absolute values, with display 4 giving temperature from a directly connected Pt100.

The safety function is rated SIL2 and the whole unit carries Lloyds approval for use on ships.

JAQUET TECHNOLOGY GROUP is a global engineering and manufacturing company offering advanced range of solutions for the detection, measurement, diagnosis and management of rotational speed, e.g. sensors and protection systems. Its main markets are automotive and truck, power generation, railway, marine, mobile hydraulics and industrial machinery. JAQUET is headquartered in Basel, Switzerland, and has subsidiaries in Belgium, China, Germany, the Netherlands, United Kingdom and United States along with a worldwide distributor and end-user service network. JAQUET TECHNOLOGY GROUP is ISO 9001 and TS 16949 certified.