Digital Speed Indicator DA72
The DA 72 from HORN is a digital rate indicator with a time base. It is a powerful tool for displaying a wide range of physical parameters such as speed, velocity, and flow rate. It operates by accurately determining the frequency represented as an electric voltage. The indicator is available also for hazardous areas.
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In general, HORN’s selection of digital displays for status and measured values expands the sensor range, offering the capability to present information on the parameters captured by the sensors. These displays feature clear and easily understandable visuals, designed to be intuitive even in challenging environmental conditions.
Moreover, their robust construction ensures durability and reliability in harsh surroundings.
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The DA 72-173 device is designed to accurately represent a wide range of physical parameters such as speed, velocity, and flow rate by detecting the frequency as an electric voltage.
The power source for the 4-digit LCD display can be derived from the measured signal itself or provided independently. In the former scenario, the display requires a minimum frequency and signal voltage level to be met for proper functionality.
By activating the rear panel switches, users gain the flexibility to assign the display to the input frequency in nearly any desired configuration.
The DA 72-173... Ex indicators are specifically designed to visually represent various physical quantities, such as RPM, speed, and flow, which are manifested as frequencies in electrical voltages. These frequencies can be generated by different sources, including sinusoidal alternating currents from active inductive sensors, impulse transmitters, or rectangular voltages from pulse sensors. It's important to note that these sensors must be approved for hazardous areas and supplied separately.
The 4-digit LCD indicator operates on extremely low auxiliary power, enabling its safe use in hazardous environments. This power can either be extracted from the measuring signal itself or supplied independently. When using the measuring signal as the power source, a minimum frequency and voltage level must be met to ensure proper operation.
For the DA 72-1732..Ex variant, there are switches located on the rear side that offer the flexibility to assign the display to the input frequency in nearly any desired configuration. This customization capability allows for optimal adaptation to specific measurement requirements.
| Technical Specifications DA 72 | |||||||||||||||||||
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| Display | 4-digit black 7-segment LCD, figures 12.7 mm high; symbol or unit of the measured quantity on the front panel upon request; visual display 0000 is only possible with external auxiliary power. |
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| Input | Frequency in the form of a sinusoidal alternating voltage or rectangular pulses. Minimum value: +0.5 V square or 0.5 Vpp sine wave of foreign supply, +4 Vp or 6 Vpp sinus at self-sufficiency; for the use of NPN-or PNP-switching open-collectors output of signal sources are the load resistors of 33 kΩ between terminals 1 and 2, 5.6 kΩ between terminals 2 and 3. For this an external auxiliary voltage of at least 5 volts is required |
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| Input resistance | approx. 5 kΩ at 6 Vpp to approx. 2,5 kΩ at 30 Vrms |
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| Frequency range | 5 Hz ... 20 kHz at self supply of energy |
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| Ranging | on the rear side of the instrument by binary adjustment of the time base within the range of 1 ms to 4095 ms with DIP switches |
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| Range adjustment | on the rear of the instrument with a DIP- switch (only for type DA 72-1732) |
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| Operating temperature | 0 ... +50 °C |
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| Storage temperature | -20 °C ... +60 °C |
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| Electrical connection | 3 grey terminals |
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| Housing | Plastic material with black front edge 72mm x 48 mm, with a two-sided front cover (white/black), both sides can be used |
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| Protection degree | Terminals IP 00 |
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| Technical Specifications DA 72 for Hazardous Areas | |||||||||||||||||||
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| Display | 4-digit black 7-segment LCD, figures 12.7 mm high; symbol or unit of the measured quantity on the front panel upon request; visual display 0000 is only possible with external auxiliary power. |
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| Input | Frequency in the form of a sinusoidal alternating voltage or rectangular pulses. Minimum value: +0.5 V square or 0.5 Vpp sine wave of foreign supply, +4 Vp or 6 Vpp sinus at self-sufficiency; for the use of NPN-or PNP-switching open-collectors output of signal sources are the load resistors of 33 kΩ between terminals 1 and 2, 5.6 kΩ between terminals 2 and 3. For this an external auxiliary voltage of at least 5 volts is required |
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| Input resistance | approx. 5 kΩ at 6 Vpp to approx. 2,5 kΩ at 30 Vrms |
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| Frequency range | 5 Hz ... 20 kHz at self supply of energy |
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| Auxiliary voltage | Will be taken either from the measuring signal or will be supplied separately. (+5 V/approx. 0,5 mA up to +30 V/approx. 6 mA) |
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| Protection degree | intrinsically safe; Ex II 2 G Ex ib IIC T6 |
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| Approval | Certificate of conformity PTB 03 ATEX 2243X |
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| Maximum values | Please note the special conditions mentioned in the certificate of conformity for the use in hazardous areas. |
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| Range adjustment | on the rear side of the instrument by binary adjustment of the time base within the range of 1 ms to 4095 ms with DIP switches |
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| Decimal point setting | setting by DIP switches on the rear side |
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| Working temperature | 0 ... +50 °C |
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| Storage temperature | -20 °C ... +60 °C |
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| Electrical connection | 3 blue terminals |
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| Housing | plastic material with black front edge 72 mm x 48 mm, with a two-sided (bright and black) front cover. Front cover may be cleaned only with wet cloth because of risc of electrostatic shock |
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| Protection degree | terminals IP 00 |
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| Mounting | The display unit has to be mounted in a way, in which the minimum protection class IP 20 is reached |
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