ASTECH TX31D/1/IFM, Руководство по эксплуатации

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TM Page 37
TRANSMITTER & IP2
PICKUP ATTACHED TO
SHAFT WITH CAK KIT
STEEL STRAPPING
STRAIN GAUGES
UNDER STAINLESS
STEEL SLEEVE
STANDARD IL2
GLASS-FIBRE
LOOP
UNIVERSAL
MOUNTING
BRACKET
IL2 INTERFACE
MODULE
Figure 13 - Shaft Mounted Transmitter & IP2 Inductive Pickup Module with Standard IL2 Loop
5.2.5 Inductive Loop IL2 with Inductive Power Pickup IP2 on Shaft Using CAK Kit
Instead of a shaft-mounted loop antenna, this arrangement uses a shaft mounted pickup module IP2 to collect power. This
is the best configuration where maximum air-gap and tolerance of shaft displacement is required. However, because the
magnetic coupling across large air-gaps is small, high resistance strain gauges of 1000 or 2000 ohms should be used - not
500 or 350 ohms. The IP2 module is a very convenient solution in many applications, as it is pre-tuned for optimum power,
is easily installed together with the transmitter using the same steel banding loops and requires minimal axial shaft length.
Figures 4.8 and 4.9 illustrate typical installations. Figure 4.10 is an example of what is probably the maximum achievable
air-gap (±200mm and ±60mm ). Note that the presence of metal close to the loop antenna will reduce the useable air-gap.