TESTO 557 - Specifications; Technical data

3 Specifications
6
3 Specifications
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3.1. Use
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The testo 557 is a digital manifold for maintenance and service
work on refrigeration systems and heat pumps. The device is only
to be used by qualified expert personnel.
With its functions the testo 557 replaces mechanical manifolds,
thermometers and pressure/temperature charts. Pressures and
temperatures can be applied, adapted, tested and monitored.
The testo 557 is compatible with most of the non-corrosive
refrigerants, water and glycol. The testo 557 is not compatible with
ammoniac refrigerants.
Then product must not be used in explosive environments!
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3.2. Technical data
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Feature Values
Measurement
parameters
Pressure: psi/ kPa/MPa/bar
Temperature: °F/°C/K
Vacuum: micron / inHg / inH
2
O / hPa / mbar/
mTorr /Torr / Pa
Sensing element Pressure: 2 x pressure sensors
Temperature: 2 x NTC
Vacuum: via external probe
Measuring cycle 0,5s
Interfaces Pressure connections: 3 x 7/16" UNF,
1x 5/8" UNF
NTC measurement
External vacuum probe
Measurement
ranges
Pressure measurement range
HP/LP: -14.7…870 psi / -100…6000 kPa
/ -0.1…6 MPa / -1…60 bar (rel)
Temperature measurement
range: -58…302 °F / -50…+150 °C
Measurement range vacuum: 0 ... 20.000
Mikron
Overload 940 psi, 65 bar, 6500 kPa, 6.5 MPa