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EMAS RDH1A EMAS ADJSTBLE DGTL FREQUENT.1 CO 220/230 V AC 30-70HZ
EMAS RDH1A digital frequency meter with a 30 to 70 Hz measuring range, 100 to 250 V AC measurement interval, three-digit display and 1CO relay output.
£65.75
Why Choose the EMAS RDH1A Digital Frequency Meter?
The EMAS RDH1A is a compact digital frequency meter and monitoring relay designed for measuring AC supply frequency in industrial electrical panels, machinery and power distribution systems. Part of the EMAS RD series, it combines clear digital frequency indication with an integrated changeover relay output for monitoring, alarm and control applications.
The RDH1A measures AC voltage and frequency across a range of 100 to 250 V AC and 30 to 70 Hz. Its three-digit seven-segment display provides a clear indication of the measured frequency, helping engineers identify abnormal supply conditions that could affect motors, generators and sensitive electrical equipment.
Operating from a nominal 230 V AC, 50 Hz supply, the device includes a 1CO changeover relay output with a resistive contact current rating of 5 A. Its compact eight-pin format, fast and quiet switching, long operating life and finger-safe design make it well suited to industrial control-panel applications.
Key Advantages
- Digital AC frequency measurement from 30 to 70 Hz.
- Measures supply voltages between 100 and 250 V AC.
- Clear three-digit seven-segment display.
- Integrated 1CO changeover relay output.
- Fast and quiet switching for industrial control systems.
- Compact eight-pin design simplifies panel installation.
Key Features
- EMAS RD series digital frequency meter.
- 30 to 70 Hz measuring range.
- 100 to 250 V AC measurement interval.
- 230 V AC operational voltage.
- 50 Hz nominal operating frequency.
- 1CO relay contact configuration.
- AgNi contact material for reliable switching.
- IP20 protection rating.
Reliable Frequency Monitoring for Electrical Systems
Electrical frequency meters monitor the frequency of an AC supply and help operators identify conditions that fall outside the required operating range. Excessively high or low frequency can affect motor speed, generator performance, timing systems and other frequency-sensitive electrical equipment.
The EMAS RDH1A provides continuous digital indication across its 30 to 70 Hz range. Its integrated relay output can be connected to an alarm, contactor or control circuit, allowing the meter to form part of a wider electrical monitoring and protection system.
Typical Applications
- Industrial electrical control panels.
- Generator frequency monitoring systems.
- Low-voltage power distribution boards.
- Motor and machinery supply monitoring.
- Automation and process control equipment.
- Frequency alarm and supervision circuits.
Technical Specifications
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| Device Type | Frequency meter | |
|---|---|---|
| Voltage | 230 V | |
| Manufacturer | EMAS | |
| Series | RD Series | |
| Model | RDH1A | |
| Product type | Digital frequency meter panel meter | |
| Control type | Digital | |
| Measurement type | AC frequency and voltage | |
| Frequency measuring range | 30 to 70 Hz | |
| Voltage measuring range | 100 to 250 V AC | |
| Operational voltage | 230 V AC | |
| Permitted voltage range | 0.85 to 1.1 × Ue | |
| Nominal operational frequency | 50 Hz | |
| Display type | Seven-segment display | |
| Number of display digits | 3 | |
| Connection type | 8-pin | |
| Contact configuration | 1CO changeover contact | |
| Resistive contact current | 5 A | |
| Relay output rating | 10 A at 250 V AC | |
| Maximum contact power | 1500 VA | |
| Contact material | AgNi | |
| Maximum switching frequency | 6,000 operations per hour | |
| Mechanical endurance | Minimum 10,000,000 operations | |
| Electrical endurance | Minimum 100,000 operations | |
| Operating temperature | -5 to +55 °C | |
| Protection rating | IP20 |
Frequently Asked Questions
What is the EMAS RDH1A used for?
It is used to measure and monitor the frequency of an AC electrical supply in industrial panels, generators, machinery and distribution systems.
What frequency range can the RDH1A measure?
The EMAS RDH1A measures AC supply frequencies between 30 and 70 Hz.
What voltage range does the RDH1A support?
The meter has a measuring interval of 100 to 250 V AC and operates from a nominal 230 V AC supply.
Does the RDH1A include a relay output?
Yes. It includes a 1CO changeover relay output for connection to alarms, contactors or control circuits.
What type of display does the RDH1A use?
The frequency meter uses a clear three-digit seven-segment digital display.
Trusted for Industrial Electrical Monitoring
EMAS digital panel meters are used by panel builders, machinery manufacturers and electrical engineers to provide clear measurement, dependable monitoring and reliable relay control within industrial electrical systems.
