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3.3
SPACE HEATER
In some outdoor installations, it may be necessary to install a space heater to prevent moisture condensation.
For Vibraswitches with a SPDT switch (Table 1, Designation A) a small conventional carbon 2 watt resistor
should be installed across terminals 6 and 8 in the detector. Proper values are shown in Table 3-1. Space heat-
ers cannot be readily installed in the field in Vibraswitches with a DPDT switch (Table 1, Designation D).
3.4
WIRING
The Vibraswitch, Model EURO 366G, is equipped with two threaded hubs for ¾" UNI-6125-74 conduit.
When the vibration amplitude is large (i.e., greater than 5 mils) it is good practice to use a short length of flexible conduit
to serve as an insulator 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 units, a junction box near the Vibraswitch
should be used.
The instrument housing must be sealed at the conduit outlets with a suitable com-
pound or "trap" to prevent infiltration of moisture-laden air or corrosive gases into
the housing.
All instrument installation wiring must be done in accordance with local codes and
commonly accepted practices.
a) The products installed in places with environment temperature of 40°C, must have
T
90°C indication. This means that the Buyer and/or the User must use a connec-
cable
tion cable having maximum service temperature not lower than 90°C.
b) The products installed in places with environment temperature of 55°C, must have
T
105°C indication. This means that the Buyer and/or the User must use a connec-
cable
tion cable having maximum service temperature not lower than 105°C.
To avoid unnecessary difficulty in wiring the unit, the following procedure should be followed in detail:
a. When installing conduit and mounting the Model EURO 366G, it is recommended that the cover be left on the unit.
Table 3-1. Space Heater Resistor Values
VOLTAGE
(DC or AC)
460
240
120
48
24
SPACE HEATER RESISTOR
(OHMS)
220.000
56.000
12.000
2.000
560
N O T E
N O T E
N O T E
Page 10
909GF299
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