Dr. E. Horn Digital Rate Indicator DA72

Digital Speed Indicator DA72-173

The DA72-173 from Dr. E. 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.

Key features

Versatile Measurement Capabilities
Flexible Power Options
Adjustable Time Base
Compact Design

We deliver directly and globally to end-users, agents, and resellers.
Contact us at marine@insatech.com.

Intuitive and reliable in harsh surroundings

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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Digital Rate Indicator with time base

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.

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Digital Rate Indicator for Hazardous Areas

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.

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Robust Digital Displays for Real-Time Monitoring

Digital status and measured value displays enhance our sensor range by providing real-time visualization of recorded parameters. Designed for harsh environments, these robust, intuitively readable displays uphold Horn’s tradition of quality and reliability.

Looking for something else? See our selection of digital displays from HORN:

Displays

FAQ

What does the DA72-173 measure?

It measures various physical parameters such as rotational speed, velocity, and flow rate by analyzing the frequency of an electrical voltage input.

What kind of display does the DA72-173 have?

It features a 4-digit LCD display with a 12.7 mm digit height for clear and easy readings.

Can I use the DA72-173 in industrial and marine environments?

Yes, it is designed for marine and industrial applications, where frequency-based measurement is needed.

What are the operating temperature limits?

It functions within a temperature range of 0°C to +50°C.

Does the DA72-173 allow for customized display symbols?

Yes, the front panel display symbols or measurement units can be customized upon request.

For technical questions

Martin Søvind Jensen

Tel: +45 2761 4502

Email: Martin.Sovind@insatech.com

Write to Martin

For commercial inquiries

Astrid Mihut

Tel.: +45 5537 2095

Email: Marine@insatech.com

We Deliver Directly to End Customers, Resellers, and Agents – Globally

At Insatech, we are proud to offer our high-quality products to all customers worldwide. Whether you’re an end customer, a reseller, or an agent, you can purchase directly from us.

By choosing us, you gain direct access to all our products, eliminating the need for intermediaries. Our global distribution possibilities ensure fast and reliable delivery to your doorstep, wherever you are.

We strive to make it easy for you as an end consumer to find the products you are looking for while supporting agents and resellers looking to grow their business. Whether you’re buying for your use or resale, we’re here to meet your needs.

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Technical Specifications DA 72
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.
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
Input resistance	approx. 5 kΩ at 6 V_pp to approx. 2,5 kΩ at 30 V_rms
Frequency range	5 Hz ... 20 kHz at self supply of energy 1 Hz ... 20 kHz at external power supply
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
Range adjustment	on the rear of the instrument with a DIP- switch (only for type DA 72-1732)
Operating temperature	0 ... +50 °C
Storage temperature	-20 °C ... +60 °C
Electrical connection	3 grey terminals
Housing	Plastic material with black front edge 72mm x 48 mm, with a two-sided front cover (white/black), both sides can be used
Protection degree	Terminals IP 00 housing IP 20

Technical Specifications DA 72 for Hazardous Areas
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.
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
Input resistance	approx. 5 kΩ at 6 V_pp to approx. 2,5 kΩ at 30 V_rms
Frequency range	5 Hz ... 20 kHz at self supply of energy 1 Hz ... 20 kHz at external power supply
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)
Protection degree	intrinsically safe; Ex II 2 G Ex ib IIC T6
Approval	Certificate of conformity PTB 03 ATEX 2243X
Maximum values	Please note the special conditions mentioned in the certificate of conformity for the use in hazardous areas. Standard data are the following: Signal input circuit: UE_max = 30 V_rms or P_Emax = 0,2 W for variable no-load voltage or signal point auxiliary voltage input circuit: UB_max = 30 V
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
Decimal point setting	setting by DIP switches on the rear side
Working temperature	0 ... +50 °C
Storage temperature	-20 °C ... +60 °C
Electrical connection	3 blue terminals
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
Protection degree	terminals IP 00 housing IP 20
Mounting	The display unit has to be mounted in a way, in which the minimum protection class IP 20 is reached

Brochure - Digital Speed Indicator DA 72 - HORN
English | pdf

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Brochure - Digital Speed Indicator DA 72 for Hazardous Areas - HORN
English | pdf

Download

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Dr. E. Horn Digital Rate Indicator DA72-173

Intuitive and reliable in harsh surroundings

Digital Rate Indicator with time base

Digital Rate Indicator for Hazardous Areas

Robust Digital Displays for Real-Time Monitoring