MODEL 365A & E365A
INSTRUCTION MANUAL
VIBRASWITCH
®
MALFUNCTION DETECTOR
909GF294
PAGE 6
or clamping it against the running machine and determining the trip point as described under
“ADJUSTMENT” in this manual. Should normal vibration exceed the range of the
Vibraswitch
®
, it is
recommended that consideration be given to a Robertshaw Velocity-Acceleration Vibration Monitor,
Model 566.
3.3
SPACE HEATER
In some outdoor installations, it may be necessary to install a space heater to prevent moisture
condensation. A small conventional carbon 2-watt resistor should be installed across terminals 6 and 7 in
the detector. It should be noted that the
Vibraswitch
®
might be ordered from the factory with the space
heater already installed. Proper values for the resistor are shown in Table 3-1.
Table 3-1. SPACE HEATER RESISTOR VALUES
VOLTAGE
(AC OR DC)
SPACE HEATER RESISTOR
(Ohms)
120/120 12,000
48 2,200
24 620
12 150
3.4
WIRING
The
Vibraswitch
®
Model 365A & E365A is equipped with a threaded hub for ¾” conduit. When the
vibration amplitude is large (ie, greater than 5 mils) it is good practice to use a short length of flexible
conduit to serve as an isolator between the rigid conduit and the
Vibraswitch
®
. Wiring into the unit
should be done with #18 stranded wire, although #14 can be used where necessary. The
Vibraswitch
®
was not designed for wiring with heavy, solid wire. However, where necessary to use a
heavier wire, as in low voltage DC, a junction box near the
Vibraswitch
®
should be used.
NOTE
The instrument must be sealed at the conduit outlets with a suitable
compound or “trap” to prevent infiltration of moisture laden air or
corrosive gases into the housing.
NOTE
All instrument installation wiring must be done in accordance with local
codes and commonly acceptable practices.
NOTE
All cable entry devices and blanking elements shall be certified in type of
explosion protection flameproof enclosure “d”, suitable for the conditions of
use and correctly installed.
NOTE
Unused apertures shall be closed with suitable blanking elements.
