38
ROSSI
GEARMOTORS
UT.D 123 rev. 3
If used in accordance with its mechanical and electric specifica-
tions, this series of instruments does not need any specific main-
tenance. Check every 6 months the functionality of the level switch
according to table 15. Protect the switch head if there may be a risk
of hurts with foreign matters.
LEVEL
18. Oil thermostat
18.1 Thermostat TRI120
II 2 GD EEx d IIB T6/T85° C IP 65
18.1.1 Specifications
It is a thermostat for oil with following features:
- internal temperature regulator, manually set by operator
- body: aluminium alloy
- liquid dilatation probe in cylindrical sump made of tropicalized brass
- cable entry:
3/4” UNI 6125 (ISO 7/1)
- setting range: 0÷120° C
- maximum bulb temperature: 150° C
- differential
Δ
T = 3 K
- maximum current: 10 A
- maximum voltage: 400 V (a.c.)/250 V (d.c.)
- SPDT contact
18.1.2 Overall dimensions
spanner
18.2 Thermostat B121-120
II 2 GD EEx d IIC T6/T85° C IP66
18.2.1 Specifications
It is a thermostat for oil with following features:
- Incremental (5 K steps) internal temperature regulator, manually
set by operator
- Body: aluminium alloy
- Liquid dilatation probe in cylindrical sump made of nickel-plated
brass
- Cable entry
3/4” NPT-F
- Thread
3/4” NPT-M
- Setting range -18 ÷ 105° C
- Maximum bulb temperature 135° C
- Current carrying capacity 15 A at 125/250 V (a.c.); 2 A at 30 V (d.c.)
- SPDT contact
18.2.2 Overall dimensions
spanner
18.3 Calibration
The thermostat is to be calibrated for a maximum threshold tem-
perature of 85° C. If, after commissioning (when gear reducer or
gearmotor reaches steady thermal conditions) the oil temperature T
oil
and ambient temperature T
amb
can be measured, calibrate the unit at
the lower temperature between the following two:
Calculation temperature [°C] = T
oil
[°C] - T
amb
[°C] +45 [°C]
T
alert
= 85 [°C]
The
machine stop
temperature mast not exceed
T
stop
= 100 °C.
18.4 Installation and maintenance
Assemble thermostat in the proper hole of gear reducer (see
position indicated in the enclosed SPT sketch). Carry out electrical
connections according to the current standards. Protect the body of
the thermostat if there may be a risk of being damaged by foreign
particles. The connection of the thermostat shall be made by cable
entries or a stopping box of a flameproof type, certified EExd IIC (for
B121-120) or EExd IIB (for TRI120) .
The thermostat must not be altered or modified: if modification is
necessary consult ROSSI MOTORIDUTTORI.
When the thermostat has an external and an internal grounding ter-
minal, the internal grounding terminal shall be used as
primary
equi-
pment grounding means whereas the external grounding terminal is
only for a supplementary (secondary) grounding connection where
local authorities permit or require such a connection.
Carry out periodical checks to verify that the whole equipment is
efficient according to table 15. To prevent ignition of hazardous
atmospheres,
disconnect circuits before opening the thermostat.
Attention! Assemble and disassemble the thermostat with gear
reducer without oil.
NOTE:
ROSSIMOTORIDUTTORI has the right to supply interchange-
able probes such as functional technical specifications and connec-
tions, but with slightly modified case dimensions.
NOTE:
resistance thermometer and level switch
must be connected to control devices of catego-
ry IPL1, if possible, according to EN 954-1 stan-
dard.
Control devices must work independently from
electric power devices, needed for the operation.
Follow the "fail+safe principle" for above mentioned devices.
Control device and/or connection logics must be realized with a lo-
cking system avoiding the accidental restart of operation, in case of
stop.
