User manual - METER SRT-457
- Do not use the unit in areas with significant temperature variations, exposure to
condensation or ice.
- Do not use the unit in areas exposed to direct sunlight.
- Make sure that the ambient temperature (e.g. inside the control box) does not
exceed the recommended values. In such cases forced cooling of the unit must
be considered (e.g. by using a ventilator).
2.
GENERAL CHARACTERISTICS
The
SRT-457
meter is equipped with Pt 100/Pt 500/Pt 1000 type input, with automatic
connection recognition ( three or four wire sensor). The measurement range spans from
-100 °C to +600 °C, and input is fully linearised accordingly to PN-A2:1999
standard. Result is showed on 4-digit LED display.
The device can be equipped with one relay (or OC type) output. Device
SRT-457
is
equipped with RS-485 / Modbus RTU communication interface and sensor supply output. The
meter can be ordered in two power supply versions.
The device has 4 buttons being used for main presets programming. To get high
protection level, the keyboard is mounted under transparent cover. To allow user to change
presets without opening the cover, an IR sensor is mounted. Remote controller keyboard is
equivalent to the device keyboard (Note, that remote controller is not a part of the
SRT-457
set
it is an additional equipment).
Two waterproof, high IP protection ratings, wall mounted types of housing are available
(T-type and F-type), predispose the device to work in hard environment conditions.
3.
TECHNICAL DATA
Power supply voltage
(depending on version)
External fuse (required)
Power consumption
85...
230
...260V AC/DC; 50 ÷ 60 Hz
(separated)
19...
24
...50V DC and 16...
24
...35V AC (separated)
T - type, max. 2 A
max. 11 VA @ 85 ÷ 260V AC/DC
max. 11 VA @ 16V ÷ 35V AC
max. 8 W @ 19V ÷ 50V DC
Measurement input
Pt 100/ Pt 500/Pt 1000 type with automatic
connection recognition ( 3 or 4-wires)
Measurement range
-100°C ÷ +600°C
Measurement accuracy
± 0,1% @ 25°C; ± one digit
Measurement wires resistance
max. 20
Ω
(every wire)
Temperature stability
50 ppm / °C
Outputs
relay:
or OC-type:
sensor power supply
U
O
:
0 or 1 NO, 1A/250V AC (cos
ϕ
= 1)
0 or 1; 30mA / 30VDC / 100mW
24V ±5% / max. 100 mA, stabilized
Communication interface
RS 485, 8N1 and 8N2, Modbus RTU,
not separated
Baud rate
1200 bit/s ÷ 115200 bit/s
4
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