CEMB USA TMP - Manual (Page 3)

CEMB SPA – Mandello del Lario
1.2.4. Resistance to environmental agents.
The transducer should be tightly sealed and insensitive to ambient humidity (max.
25%) and resistance to contamination by dusts and lubricating oils with a degree of
protection IP 65 (CEI standards)
1.2.5. Cables and connectors.
The transducers are complete with male-female connection to MIL standards, able
to withstand the mechanical and thermal stresses described in points 1.2.3 and
1.2.4.
1.2.6. Mounting.
It should be possible to install the transducer in any direction and fasten it with a
sufficiently rugged screw (e.g. M8 thread).
TEST INSTRUMENTS
1.3.1. Types of instruments.
All instruments are fully transistorized and the signal coming from a transducer is
sent to the respective conditioning and measuring circuit. The scanning system is
not permissible.
1.3.2. Measurement range.
The instrument should allow measurement and supervision of the RMS value of the
vibration speed within a range from 0 to 10 mm/s.
1.3.3. Frequency range.
The instrument response is linear in a frequency range from 10 to 1000 Hz.
1.3.4. Threshold discriminator circuit.
Each measuring channel is provided with a threshold discriminator circuit of static
type with amplitude comparator, suitable for driving an output relay (SPDT contact)
and indicator lamp (LED).
The tripping level of the alarm threshold is adjustable between 10% and 100% of
the measuring scale.
The alarm threshold is provided with a time delay device, independent from the
value and adjustable from 0 to 20 seconds.
The system output logic is as follows: under normal condition (vibration level below
the threshold) the relay is de-energized and the LED is unlit. The alarm threshold is
of the “unlatched” type, i.e. the output relay remains energized and the relative LED
is lit up only as long as the input signal is higher than the threshold value.