Product Core Brief

• Model: LR4220E
• Brand: YOKOGAWA
• Series: LR4200E Series Horizontal Laboratory Recorder
• Core Function: Multi-channel chart recorder for universal input measurement and continuous recording of voltage, thermocouple, and RTD signals.
• Product Type: Laboratory Chart Recorder
• Key Specs: 4-channel configuration | Universal input: voltage, thermocouple, RTD | IC memory card storage | Dot-matrix printing
• Condition: New Surplus / Refurbished
• Status: Discontinued by Yokogawa

Key Technical Specifications

• Product type: Horizontal laboratory chart recorder
• Series: LR4200E family
• Channel configuration: 4 recording channels (LR4220E)
• Input types: Universal input — DC voltage, thermocouple (12 types), RTD
• Measurement accuracy: ±0.05% of reading + ±0.03% of range + 1.0 μV (for voltage ranges ≥ 1 mV)
• Measurement range: 0.1 mV to 200 V full scale
• Measurement cycle: Up to 135 Hz
• Chart paper: Fan-fold paper, 250 mm effective recording width, up to 20 m length
• Chart speed: 10 to 1200 mm/h or mm/min
• Recording method: Digital servo with felt-tip pens
• Printing: Dot-matrix ribbon printer (monochrome)
• Display: Fluorescent display tube, 4 lines × 20 characters
• Memory: IC memory card slot (standard), up to 32 k data points per channel
• Optional features: Remote control, 4 alarm outputs, GP-IB or RS-232C communication, math computation, floppy disk drive
• Dimensions: 448 (W) × 455 (D) × 185 (H) mm
• Weight: Approximately 14 kg (4-pen model)
• Power supply: AC powered
• Handling: ESD-sensitive instrument; protect connectors and chart mechanism

Note: The LR4220E is a specific 4-channel variant within the LR4200E series. Exact option configuration (communication interface, alarm outputs, math function, floppy disk drive) should be confirmed from the nameplate before ordering.

 

Product Introduction

The LR4220E is a 4-channel horizontal laboratory recorder from the Yokogawa LR4200E series. It provides continuous chart recording for voltage, thermocouple, and RTD signals with dot-matrix printing and IC memory card data storage.

This recorder has been widely used in laboratory testing, calibration stations, R&D environments, and process monitoring applications where a permanent paper record is required alongside digital data capture. The LR4200E series has been discontinued by Yokogawa, making verified surplus units valuable for labs and facilities maintaining existing test setups.

For procurement and maintenance teams, the LR4220E is important because replacing a failed recorder in an established test station can be disruptive. A verified surplus unit with matching channel count and option configuration allows a like-for-like replacement without reconfiguring the entire measurement setup.

QA & Inspection SOP

Each unit is inspected before release:

1. Nameplate verification: Confirm the model reads LR4220E and record all option codes.
2. Visual inspection: Check the housing, chart compartment, pen mechanism, and front panel for damage or wear.
3. Pen and ribbon check: Verify felt-tip pens are present and the printer ribbon is installed or available.
4. Power-on test: Energize the unit and confirm normal display startup and self-check.
5. Input test: Apply a known signal to each channel and verify measurement display and pen response.
6. Chart drive test: Run the chart mechanism at multiple speeds to confirm smooth paper feed.
7. Memory card test: Verify IC memory card slot operation and data storage function.
8. Printer test: Confirm dot-matrix printer operation and print output quality.
9. Optional function check: If equipped, verify GP-IB, RS-232C, alarm outputs, or floppy disk drive.
10. Packaging: Secure the pen assembly and chart mechanism for shipment.

Full calibration verification requires a certified signal source. If calibrated performance is required, confirm test certificate availability before dispatch.

Installation Pitfalls & Guide

❗ Confirm the option configuration. The LR4220E may be equipped with different optional functions such as GP-IB, RS-232C, alarm outputs, math computation, or floppy disk drive. Match the option codes to the original unit.

❗ Check chart paper compatibility. The LR4200E series uses fan-fold chart paper with a 250 mm effective recording width. Ensure the correct paper type is available before commissioning.

❗ Verify input range settings. Each channel can be configured for different input types and ranges. Confirm channel settings match the connected sensors before taking measurements.

❗ Replace pens and ribbon as consumables. Felt-tip pens and printer ribbons are consumable items. Stock spares to maintain continuous recording capability.

❗ This product is discontinued. Yokogawa has discontinued the LR4200E series. Replacement options include the MX100, MW100, GP10/GP20, or GX10/GX20 series, but these are not direct drop-in replacements and may require setup changes.

Installation steps:

1. Pre-install: Record the original unit’s option codes, channel configurations, and input settings.
2. Positioning: Place the recorder on a stable, level surface with adequate ventilation.
3. Wiring: Connect input signals according to the channel configuration, observing correct polarity and terminal assignments.
4. Load consumables: Install chart paper, pens, and printer ribbon.
5. Power-on: Energize the unit and allow it to complete the startup sequence.
6. Configuration: Set channel input types, ranges, chart speed, and alarm settings as required.
7. Verification: Apply test signals to each channel and confirm correct display, recording, and printing.

 

Technical FAQ

Is LR4220E the same as LR4200E?
LR4200E is the series name. LR4220E is a specific 4-channel variant within the LR4200E series. The series also includes 1-, 2-, and 3-channel models.

What does the “22” in LR4220E indicate?
Within the LR4200E series naming convention, the digits following “LR42” indicate the channel configuration. LR4220E corresponds to the 4-channel model.

Can I still buy this recorder new from Yokogawa?
No. The LR4200E series has been discontinued by Yokogawa. Surplus and refurbished units are available through industrial spare channels.

What are the recommended replacement models?
Yokogawa suggests the MX100, MW100, GP10/GP20, or GX10/GX20 series as successors. These are paperless or touch-screen recorders and are not direct drop-in replacements.

What consumables does this recorder need?
Felt-tip recording pens, dot-matrix printer ribbon, and fan-fold chart paper (250 mm width). IC memory cards are used for digital data storage.

Do you offer warranty on surplus units?
Surplus and refurbished recorders are typically covered by a limited functional warranty. Exact terms depend on stock source and condition, so confirm warranty length and return conditions before purchase.

If you can share the nameplate photo, I can confirm the exact option configuration and refine the specifications further.