RD8250-Series

Supported Applications

The Omega RD8250 Series is a paperless recorder designed for industrial process monitoring. It functions as a solid-state data recorder and panel indicator, replacing traditional paper recorders by storing historic data on CompactFlash™ memory cards to eliminate issues with jamming, ink smudging, or pen clogging. The instrument supports real-time trend viewing and digital readouts for applications requiring the measurement of voltage, current, thermocouples, RTDs, frequency, and speed inputs.

Operating Conditions & Performance

The RD8250 Series operates within an ambient temperature range of -10 to 50°C (14 to 122°F). Relative humidity is rated at 80% for temperatures up to 31°C (88°F), decreasing linearly to 50% @ 40°C (104°F). The device is specified for indoor use only, meeting Installation Category II per IEC 664 and Pollution Degree Level II per IEC61010-1.

Performance specifications vary by input type:

• DC Voltage Accuracy: 0.1% of reading
• DC Current Accuracy: 0.1% of reading (excluding 250 Ω external shunt)
• Thermocouple Accuracy: 0.3% FS (typical) for types J, K, T, and E
• RTD Accuracy: 0.3% FS (typical) for 100 Ω Pt 385 and 100 Ω Pt 392 sensors
• Frequency Input Range: 0 to 10,000 Hz or 0 to 600,000 rpm with ±1 Hz accuracy for frequency and ±1 rpm below 9999 rpm (±10 rpm above) for speed
• Ambient Temperature Sensor Accuracy: ±1.5°C (2.7°F)

Data storage capacity reaches up to 2 Gigabytes on CompactFlash™ cards, with a measurement rate of up to 100 samples/s per channel.

Configuration Options

The series offers configurable inputs and outputs tailored for specific process needs. Key capabilities include:

• Inputs: Two universal, user-selectable isolated channels supporting DC Voltage (0 to 25V ranges), DC Current (0/4 to 20 mA or 0 to 50 mA), Thermocouples (J, K, T, E), RTDs (100 Ω Pt 385/Pt 392), Frequency, and Speed.
• Outputs: Two alarm relay outputs rated at 30 V and 0.5 A form 'A' relays; one opto-isolated digital control input activated by 5 to 12 Vdc @ 10 mA typical.
• Data Storage & Display: LCD graphics display (160 x 80 pixels) with user-controlled backlight and contrast. Data is stored on CompactFlash™ cards ranging from 512 MB to 2 GB.
• Power Options: Models support external AC power via a universal adaptor or isolated DC input, with an optional internal battery pack for uninterrupted operation during blackouts.

Key Product Differences

The RD8250 Series is differentiated by model number and available options:

• RD8252: Paperless recorder with 2 inputs, powered by an external AC wall transformer (100 to 240 Vac, 50/60 Hz) providing 9 ±0.5 Vdc @ 5 VA.
• RD8253: Paperless recorder with 2 inputs, designed for isolated DC power supply of 12 to 24 Vdc (not compatible with the internal battery pack option).

Available order suffixes and accessories include:

• -UPS: Rechargeable battery pack providing up to 8 hours typical operation during power loss for RD8252 units.
• -USB: Front-panel USB 2.0 slave port for data transfer and remote real-time display using Navigator software.
• -EI: Ethernet communications port supporting real-time data, historic transfer, remote control, configuration via web server, and built-in web interface.
• NEMA 4X (IP66) Enclosure Kit: Optional enclosure for enhanced environmental protection.