User's Manual

3 Specifications
6
3 Specifications
3.1. Use
The testo 550 is a digital manifold for maintenance and servicing
work at refrigeration systems and heat pumps. It must only be used
by qualified authorized personnel.
The testo 550 replaces mechanical manifolds, thermometers and
pressure/temperature tables by means of its functions. Pressures
and temperatures can be loaded, adjusted, tested and monitored.
The testo 550 is compatible with most non-corrosive refrigerants,
water and glycol. The testo 550 is not compatible with refrigerants
that contain ammonia.
The product must not be used in areas at risk of explosion!
3.2. Technical data
Characteristic Values
Parameters Pressure: kPa / MPa / bar / psi
Temperature: °C/°F/K
Sensor
Pressure: 2 x pressure sensor, temperature:
2 x NTC
Meas. cycle 0.75 s
Measurement
channels
Quantity: 4
Interfaces Pressure connections: 3 x 7/16" UNF
NTC measurement
Measuring ranges
Pressure measuring range HP/LP:
-1 to 50 bar (rel)/-14.7 to 725 psi (rel)/
100 to 5000 kPa (rel)/0.1 to 5 MPa (rel)
Temperature measuring range:
-50 to +150 °C/-58 to 302 °F
Humidity application
range
10 to 90 % RH
Overload 60 bar, 6000 kPa, 6 MPa, 870 psi
Resolution
Pressure resolution: 0.01 bar/0.1 psi/
1 kPa/0.001 MPa
Temperature resolution: 0.1 °C/0.1 °F