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Data Sheet | Instruction Manual
Testo 557 Digital 4-Way Manifold Set with Bluetooth and Pirani Gauge
The premium Testo 557 digital 4-way manifold set is an industrial-grade thermodynamic instrumentation system engineered for heavy-duty commissioning, deep evacuation, and real-time diagnostics on air conditioning systems, cooling plants, and heat pumps. Built around a robust 4-way metal valve block with 4 connections and hose holders, this master platform replaces multiple manual tools. It features a high-precision external Pirani gauge for vacuum measurement, ensuring the rapid, safe evacuation of refrigerant circuits. The system executes real-time superheating and subcooling calculation routines for 60 pre-stored refrigerants. With integrated Bluetooth connection, data streams directly to the free Testo Smart App for remote display monitoring and automated professional PDF report generation.
Industrial & HVAC Applications
- System Evacuation & Commissioning: High-precision deep vacuum tracking using the Pirani sensor matrix to eliminate moisture and non-condensable gases.
- Automated Thermal Balancing: Concurrent calculation of real-time superheating and subcooling parameters using heavy-duty clip-on pipe sensors.
- Sealing Integrity Audits: Running automated, long-term temperature-compensated leakage tests to verify structural layout sealing before refrigerant charging.
Technical Characteristics
| Pressure Measuring Scale | -1 to 60 bar range with a tight 0.01 bar resolution step |
| Pressure System Accuracy | High-tier accuracy at ±0.5% of full-scale value (fs) |
| Pressure Overload Threshold | 65 bar peak high-pressure structural resistance limit |
| Vacuum Diagnostic Matrix | 0 to 20,000 micron scaling range via external Pirani sensor |
| Vacuum Resolution Precision | 1 micron (from 0 to 1,000 micron interval limits) |
| Temperature Measuring Span | -50 to +150 °C coverage via plug-in NTC thermistor channels |
| Temperature Accuracy Value | ±0.5 °C with 0.1 °C display resolution increments |
| Wireless Synchronization Path | Integrated Bluetooth 4.0; operational tracking range up to 20 m |
| Refrigerant Profile Library | 60 pre-programmed profiles with automated online application update loops |
| Hardware Ingress Protection | Sturdy impact-protected frame case holding certified IP42 protection limits |
Package Contents
- Testo 557 4-way digital manifold logging module carries a built-in suspension hook
- 2x NTC clamp temperature probes for rapid external pipe profiling
- Precise external Pirani gauge attachment block for high-accuracy vacuum tracking
- Official factory calibration protocol validation records and technical manual