Product Description

The Citizen CL-S631II is a premium 4-inch industrial desktop barcode printer engineered for applications that demand high-resolution 300 dpi printing and long-lasting labels. Supporting both Thermal Transfer (TT) and Direct Thermal (DT) printing, the CL-S631II produces crisp barcodes, small text, logos, and graphics, making it an excellent choice for healthcare, pharmaceutical, electronics, manufacturing, retail, warehousing, and compliance labeling. It prints at speeds up to 4 inches per second and supports 360-meter ribbons, minimizing media changes and maximizing uptime.

Built with Citizen's proven Hi-Lift™ all-metal print mechanism, Hi-Open™ case, and ARCP™ (Automatic Ribbon Control Protection) technology, the CL-S631II ensures consistent ribbon tracking and outstanding print quality. The CL-S631II-EPUBK includes Premium Ethernet, USB, and Serial connectivity for enterprise networking, while the CL-S631II-EPUBK-C adds a factory-installed auto cutter for automated label, ticket, and tag cutting.

Key Features

• 4-inch Industrial Desktop Label Printer
• Thermal Transfer & Direct Thermal printing
• 300 dpi high-resolution printing
• Prints up to 4 ips (100 mm/sec)
• Premium Ethernet (10/100 Base-T)
• USB 2.0 and RS-232 Serial interfaces
• Hi-Lift™ all-metal print mechanism
• Hi-Open™ industrial case for easy media loading
• ARCP™ Automatic Ribbon Control Protection
• Supports ribbons up to 360 meters
• Cross-Emulation™ for Zebra® ZPL II®, Datamax®, EPL2®, and Citizen BASIC
• Adjustable gap, black mark, and notch sensors
• ENERGY STAR® certified
• Factory Auto Cutter available on CL-S631II-EPUBK-C

Ideal For

• Healthcare
• Pharmaceutical labeling
• Electronics manufacturing
• Medical laboratories
• Manufacturing
• Warehousing
• Distribution Centers
• Retail
• Shipping & Logistics
• Asset Management
• Product Identification

Common Applications

• High-density barcode labels
• Product identification labels
• Compliance labels
• Healthcare specimen labels
• Pharmacy labels
• Electronics labels
• Shipping labels
• Inventory labels
• Shelf labels
• Asset tracking labels
• Continuous tags and tickets
• Durable thermal transfer labels

Product Specifications

Available Models

Shopify Variant Structure

Media Handling

• Standard Tear-Off (CL-S631II-EPUBK)
• Auto Cutter (CL-S631II-EPUBK-C)

Print Method

• Thermal Transfer + Direct Thermal

Resolution

• 300 dpi

Connectivity

• USB + Serial + Premium Ethernet

Connectivity

Both models include:

• USB 2.0
• RS-232 Serial
• Premium Ethernet (10/100 Base-T)

Compatible with Windows®, macOS®, Linux®, warehouse management systems (WMS), ERP software, shipping applications, and labeling software supporting Citizen, Zebra®, Datamax®, or EPL printer languages.

Compatible Media

The CL-S631II supports a wide variety of media, including:

• Thermal Transfer labels
• Direct Thermal labels
• Paper labels
• Polypropylene labels
• Polyester labels
• Shipping labels
• Barcode labels
• Product labels
• Compliance labels
• Asset labels
• Shelf labels
• Continuous media
• Tags and tickets

Compatible Ribbon Types

• Wax Ribbon
• Wax/Resin Ribbon
• Resin Ribbon

Why Choose the Citizen CL-S631II?

The Citizen CL-S631II is designed for businesses that need exceptional print clarity without sacrificing industrial reliability. Its 300 dpi print engine produces crisp text, small barcodes, and detailed graphics, making it ideal for regulated industries and product identification. Combined with dual print technology, long-life ribbon support, Premium Ethernet networking, and optional automatic cutting, it offers a versatile solution for demanding labeling environments.

Benefits

• Print high-density barcodes and fine text with outstanding clarity
• Produce durable thermal transfer or economical direct thermal labels
• Reduce downtime with 360-meter ribbon capacity
• Easily replace Zebra® and Datamax® printers using Cross-Emulation™
• Reliable network printing with Premium Ethernet
• Increase productivity with the optional factory auto cutter
• Rugged all-metal construction for long-term performance

Industries Served

• Healthcare
• Pharmaceuticals
• Electronics Manufacturing
• Manufacturing
• Warehousing
• Distribution
• Logistics
• Retail
• Government
• Asset Management

What's Included

CL-S631II-EPUBK

• Citizen CL-S631II Printer
• Power Cable
• USB Cable (if supplied by distributor)
• Quick Start Guide

CL-S631II-EPUBK-C

• Citizen CL-S631II Printer
• Factory-Installed Auto Cutter
• Power Cable
• USB Cable (if supplied by distributor)
• Quick Start Guide