LEYBOLD THERMOVAC TTR 101 N, Operating Manual

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14 300544655_002_C1 - 11/2016 - © Leybold
Temperature
The transmitter has an active and individual sensor temperature compensation circuit that ensures accurate
measurement in a wide temperature range.
For best measuring performance avoid large temperature gradients and direct cooling like air-condition air stream
or heating like a pump exhaust stream.
Bake out
The transmitter electronics can withstand maximum 85 °C (185 °F) when the power is turned off.
Contamination
Locate and orient the transmitter where contamination is least likely. The sensor has a low filament temperature of
only 35 °C above ambient temperature; therefore, the sensor is less prone to contamination by cracking products
from fore vacuum pump oil.
Vibrations and instant air inrush
The sensor elements are extremely robust to mechanical forces like vibration and G-forces. The sensor element
cannot be damaged by fast and repeated pressure cycles or instant inrush of air.
3.4
Vacuum connections
The transmitters are available with different types of vacuum fittings. When mounting the transmitter, always
ensure that all vacuum sealing items and surfaces are clean, without damage and free of particles. Do not touch
the vacuum flange sealing surface.
Pressure range
The standard TTR 101 N THERMOVAC transmitter are internally sealed with elastomer FPM sealing and is
intended for use in the pressure range 5×10
-5
to 1500 mbar. If used in UHV applications the out gassing rate of
FPM can be too high.
If the transmitter is backfilled with a liquid like pump oil the sensor element is likely permanently
damaged. The transmitter cannot be cleaned using solvents.
If the transmitter will be exposed to pressures above atmospheric pressure make sure that proper
vacuum fittings are used. Ensure that the internal system pressure is at ambient pressure
conditions before opening the vacuum system and removing any connections.
Attention
Caution
!
!
!
!