Use Of The Unit For Its Intended Purpose; Product Description; Display And Controls - testo 555 Bedienungsanleitung

Pt 100 connection
testo 556
( only)
Pt 100 connection/
external memory
testo 556
( only)

2. Use of the unit for its intended purpose

Employ the unit for the following applications only:
testo 555/556
The
engineering:
The unit is characterised by the following features:
- rugged and easy to use
- watertight aluminium case (protection class IP 65)
- acid and water-resistant film keypad
- pressure sensors with stainless steel diaphragms
- 3-way valve block
- sensors resistant to inadvertently induced oil, contamination
and pressures up to 75bar
- the ambient pressure has no influence on the measurements
- the data of new refrigerants can be transferred to the unit by
the manufacturer.

3.1 Display and controls

Battery compartment
is a manifold for all fields of refrigeration

3. Product description

The flow routes of the valve
block are equivalent to those
of conventional manifolds.
The pressure is measured at
the left and right hose
connection when the valves
Control keys
are closed.
Opening the valves opens the
flow routes.
The pressure ranges are equal
for high and low pressures.
Display
This prevents the accuracy
and stability of the sensors
being affected if they are
inadvertently exchanged.
3-way
valve block
The seriell connection socket in the battery
compartment should not be used! It is used
for service purposes by the manufacturer.
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