IE-SNC-T33(4)19+T73(4)11-09
3
communication protocol:
Modbus RTU
device address:
01
communication speed:
9600Bd, without parity, 2 stop bits
display:
switched ON
value displayed at higher line:
temperature (temperature / pressure)
– by device type
value displayed at lower line:
relative humidity only
temperature unit:
°C
pressure unit:
hPa
preset computed value:
dew point temperature
correction for altitude:
0 hPa
(absolute pressure)
Device installation
Device is designed for wall mounting. There are two mounting holes at the sides of the case. It
is NOT recommended to use the device for long time under condensation conditions. It could be the
cause of water steam condensation inside the sensor’s cover into water phase. This liquid phase
stays inside sensor’s cover and can’t escape from the cover easily. It can dramatically increase
response time to relative humidity change. If water condensation occurs for longer time it can cause
sensor damage. Similar effect can occur under water aerosol conditions. Don’t connect device while
power supply voltage is on. Interconnection terminals for T3319(P), T3419(P), T7311 and T7411
devices are accessible after unscrewing four screws and removing the lid. Measuring temperature,
relative humidity and eventually pressure sensors are non-removable device parts. Lace the cable
through a gland at the case wall. Connect the cable to terminals with respecting the signal polarity
(see figure). Terminals are self-clamping and can be opened by a suitable screwdriver. For the
opening, insert the screwdriver to smaller terminal hole and lever by him. Do not forget to tighten
glands and case lid with inserted packing after cables connecting. It is necessary for warranting of
protection IP65. Connect complementary female connector for T3319L, T3419L, T7311L and
T7411L transmitters in accordance with the table in Appendix B of this manual.
Devices T3319(P) and T7311 are supplied with connection cable equipped with connector
for connection to RS232 interface. For devices with RS485 output there is recommended to use
shielded twisted copper cable, maximal length 1200m. The cable must be located at indoor rooms.
Nominal cable impedance should be 100 Ω, loop resistance max. 240 Ω, cable capacity max.
65 pF/m. Outside diameter of the cable for T3419(P) and T7411 connection must be from 3 to 6.5
mm. Suitable cable is e.g. SYKFY 2x2x0.5 mm
2
, where one wire pair serves for device powering
and the other pair for communication link. For devices T3319L, T3419L, T7311L and T7411L use
cable with respect to female connector parameters. Do NOT connect shielding at connector side.
The cable should be led in one line, i.e. NOT to „tree“ or „star“. Termination resistor should
be located at the end. For short distance other topology is allowed. Terminate the network by a
termination resistor. The value of the resistor is recommended about 120
. For short distance
termination resistor can be left out.
The cable should not be led in parallel along power cabling. Safety distance is up to 0.5 m,
otherwise undesirable induction of interference signals can appear.
Electrical system (wiring) may do only worker with required qualification by rules in
operation.
The devices T3319P and T3419P are designed to measure pressured air. It is good to mount
probe directly into high pressure area (i.e. air pressured pipe) if it is possible. There is other
possibility to use flow chamber SH-PP, see Appendix C.
Before you remove probe of the transmitter T
xxxx
P, make sure that the pressure in a
pressure chamber (duct, pipe …) and the ambient pressure are in equilibrium
