Digital & Bargraph Instruments

Technical Description

The instruments are designed for industrial applications where precise measurements and clear displays are required in a range of sizes and colours. They can be fitted directly in mosaic systems or used in
conventional control panel applications.

All instruments will operate with AC or DC power supplies and these can be 18-36 V DC or 24V AC 10%. Other voltages can be supplied on request.

Mechanical Construction

The instruments are supplied in standard dimensions to DIN 43700. The case sizes are 48 x 24, 72 x 24, 96 x 24, 48 x 48, 96 x 48, 144 x 72 mm or larger on request. All instruments are provided with fixings for panels or mosaic systems. We also have an instrument size of 72 x 36 mm for the 18 x 18 mm mosaic systems.

Digital Instruments with Analogue Inputs

The inputs can be 0-20mA or 4-20mA DC currents or standard voltages of 0-2, 0-20, 0-200 v DC.
Other inputs can be supplied on request. These instruments are available with 3½ or 4½ digit displays, in red or green. The maximum readings would be - 1999 to 1999 for the 3½ displays and - 19999 to 19999 for the 4½ digit displays. The range of all instruments is adjustable from the front. All instruments are preset to customer's specification at the factory and a 48 hour continuous test is carried out. Adjustable alarm points are available on most instruments.

Bargraph Displays

The simplest unit in the range has 20 LED segments and can be arranged as a moving point bar, in a verticle or horizontal format. This can be enhanced with the addition of a 3 digit display and a further option allows two alarm points with adjustable limits. Settings can be made within the instruments or by external potentiometer. To highlight different areas of working the bar can be supplied in different colours. For example, the normal working area may be green, the overrange area red and the underrange in yellow LED's

Another feature allows 3 levels of brightness, 100%, 70% or 40%, externally adjustable to allow for low lighting situations such as control rooms, driver cabs or night time operation.

Digital Displays with BCD Inputs

The instruments can be supplied in 1 to 6 digit formats and in various sizes. The inputs are positive logic 0 to 24v DC and 0 to 5v DC. The reading range is from 0-999999 or larger on request.

IP Ingress protection and Electrical Connections

All instruments provide protection to IP50 on the front and IP00 on the rear.
The connections to the instruments are by Mini-Faston (2.8 x 0.8 mm) based on DIN 46244 and DIN 46247.
Storage and delivery temperature range: -25 to +60°C
Operating Temperature Range: 0 to 45°C
The maximum relative humidity is 75%.
Enhanced weather protection is available for some instruments in the range where required.

Accuracy

The digital displays have an accuracy of ± 0.5% of full scale and ± 1 digit with a temperature
coefficient of better than 80ppm/°C.
The bargraph displays have an accuracy of:
Baragraph section: ± 0.5% of full scale, ± 1 segment
Digital display section: ± 0.5% of full scale, ± 2 digits with a temperature coefficient of better than 150 ppm /°C.