What is the Harvard Apparatus PHD ULTRA™ Satellite Syringe Pump?

The PHD ULTRA™ Satellite is a compact, secondary syringe pump that combines with a standalone PHD ULTRA™ to create a multi-channel gradient delivery system. Rather than purchasing a separate controller, the Satellite draws power and control signals directly from the host pump via RS-485 — forming an integrated, fully synchronized multi-pump system at significantly lower cost and footprint than standalone multi-channel alternatives.

Satellite pumps are available in three configurations: standard infuse/withdraw (70-3406), push/pull with dual syringe capability (70-3408), and high-force 4400 variant (70-3410) for viscous fluids or high-resistance fluidic circuits. All configurations share the same precision mechanics as the standalone PHD ULTRA™, delivering flow rates from 3.06 pl/min to 215.8 ml/min with ±0.25% accuracy.

Key Features

• RS-485 Powered from Host PHD ULTRA™: No separate power supply needed — the Satellite draws power and receives all commands via RS-485 from the standalone PHD ULTRA™, simplifying cable management and instrument footprint.
• Three Configurations for Different Applications: Standard infuse/withdraw (70-3406), push/pull for perfusion circuits (70-3408), and high-force 4400 variant (70-3410) with 200 lb linear force for demanding fluidic systems.
• Full Gradient Capability: Combining a Satellite with a standalone PHD ULTRA™ creates a complete multi-channel gradient system for drug mixing, HPLC-style gradient elution, or perfusion experiments requiring precise simultaneous multi-pump coordination.
• Identical Flow Range and Precision: Covers 3.06 pl/min to 215.8 ml/min with ±0.25% accuracy (standard models), matching the standalone PHD ULTRA™ for seamless integration into existing workflows.
• Compact Footprint: At 11.75 × 5.5 × 6.5 in and 11.7 lb, the Satellite adds a full-capability pump channel without occupying the bench space of a full standalone instrument.
• Footswitch Input and USB Connectivity: Includes footswitch input for hands-free start/stop operation, plus USB and RS-485 connectors for integration into automated infusion protocols.