Digital displays are panel or board indicators that display the data acquired from field measuring instrumentation.
Riels Instruments offers various types of digital displays:
• Digital indicators
• Dispensers & timers
• Digital recorders
• Data acquisition instruments
• Dataloggers Digital indicators or digital displays show a value on a un display in the form of a number or by a graduated scale comprised of LEDs that light up in succession, simulating analogue display.
The digital indicators are subdivided into two categories, differentiated by the type of input signal they receive which can be in impulses or current. Impulse digital indicators receive the impulse signal and display the measurement in the required technical measuring unit. These indicators are mainly used with litre counters.
Current digital indicators, however,, convert an input 4÷20mA analogue or a 0-10V voltage signal into technical measuring units, which are then displayed. Typical applications of these digital indicators are the display of signals originating from transmitters that can relate to temperature, humidity, pressure, velocity, flow, level, force, etc. for the most diverse of industrial sectors, operating machines, automations.
Digital dispensers are indicators that, besides displaying the required measurement, can send an output signal with a start-stop function to control a valve or another instrument.
Digital dispensers can also be equipped with some optional functions such as alarms and analogue outputs.
In certain digital predeterminators some alarm thresholds can be set up in such a way that when the value reading exceeds these thresholds, some digital outputs are activated that are useful for the indication and control of the event.
Other digital dispensers can be equipped with analogue outputs that, by means of an electric signal, can connect them to a recording instrument to memorize the signal.
Digital recorders are electronic devices that record data through an internal sensor or are connected to an external sensor. Certain digital recorders can be connected to a PC and allow data to be displayed through dedicated software.
Others, however, have their own interface complete with keypad and display. One of the main advantages of usingdigital recorders is the possibility of memorizing the data automatically on a daily basis, permitting an accurate mapping of the conditions being monitored.
Data acquisition instruments can be compared with the digital recorders, but they have certain features that differentiate them. Firstly, the frequency of sampling that indicates the number of times per second in which an analogue signal is measured and memorized digitally, is much higher with respect to those in the digital recorders.
The advantage of using data acquisition instruments is that they can record several measurements simultaneously, so as to obtain the relationships that exist between the elements that comprise the object under analysis.
Dataloggers are inexpensive instruments, robust and reliable over time, designed for monitoring temperature and recording temperature/relative humidity measurements. They are available in various versions: with or without LCD display, with sensors inside or outside of the housing or with a cable. Analysis of the acquired data is performed by the supplied software.
The operations concerning startup, stop, configuration, data downloading and setting of the memorization interval of thedatalogger are set up by keyboard or computer.
It is possible, using a computer, to set up a password that protects the access to the configuration data.
Typical uses include the monitoring of the temperature/humidity during transport, storing in the warehouse of fresh and frozen food produce, fruit and vegetables, flowers, pharmaceutical products, sensitive products, photographs, paper, explosives, laboratories generally.
The configuration and the downloading of the data onto a PC is made very simple by the dedicated software.
