Atal ST485-101 User manual

Temperature, humidity, CO2 and pressure
regulator with RS485 serial output.
Manual for ST485-101, STR485-102, STR485-104, STR485-104S,
STR485-103, ST485-101E, AT-VLS-101DRS, AT-VLS-102DRS,
STRP485-102 and STRP485-104
ATAL B.V.
Ampèrestraat 35-37
NL-1446 TR PURMEREND
Postbus 783
NL-1440 AT PURMEREND
T([phone]
F([phone]
E[email protected]
Iwww.atal.nl

2
Table of content
1. General description ......................................................................................................... 5
2. Regulator mounting and connection............................................................................. 6
3. Typical application wiring, connection of terminals.................................................... 7
4. Dimensions....................................................................................................................... 7
5. Description of device function and setting................................................................. 10
5.1. Device setting from the manufacturer ........................................................................ 11
5.2. Relay outputs.................................................................................................................. 11
5.3. Binary inputs................................................................................................................... 11
5.4. Carbon dioxide concentration measurement ............................................................ 12
5.5. Actual regulator preset.................................................................................................. 12
5.5.1. Value assigned to output relay........................................................................ 12
5.5.2. When close output relay ................................................................................... 13
5.5.3. Delay....................................................................................................................... 13
5.5.4. Hysteresis ............................................................................................................. 14
5.5.5. Regulator address setting ................................................................................ 14
5.6. Regulator setting change.............................................................................................. 14
5.6.1. Setting with PC and TSensor software ......................................................... 14
5.6.2. Setting with using regulator keys................................................................... 15
5.6.3. Setting with using of Modbus communication protocol.......................... 15
5.7. Extended setting mode................................................................................................. 15
5.8. Restore to „Factory default“ ......................................................................................... 21
6. Description of communication protocols.................................................................... 22
6.1. Modbus RTU .................................................................................................................. 22
6.1.1. Supported functions........................................................................................... 22
6.1.2. Jumper................................................................................................................... 23
6.1.3. Modbus registers of the regulator.................................................................. 23
6.1.4. Far controlling of output relays status.......................................................... 24
6.1.5. Output relay alarm condition configuration with using of Modbus
communication protocol 2................................................................................................. 25
6.2. Protocol compatible with Advantech-ADAM standard............................................. 26
6.2.1. Jumper................................................................................................................... 26
7. Error States of the device............................................................................................. 27
8. Readings on LCD display............................................................................................. 28
9. Preventive maintenance and calibration.................................................................... 29
10. Technical specification.................................................................................................. 29
10.1. Technical parameters.................................................................................................... 29
10.1.1. Common parameters.......................................................................................... 29
10.1.2. ST485-101 - temperature regulator................................................................. 30
10.1.3. STR485-102 - relative humidity and temperature regulator..................... 30
10.1.4. STR485-104(P) - temperature and humidity regulator .............................. 31
10.1.5. STR485-103 - relative humidity and temperature regulator..................... 31
10.1.6. ST485-101E - temperature regulator, external probe................................ 31
10.1.7. AT-VLS-101DRS - CO2regulator..................................................................... 31
10.1.8. AT-VLS-102DRS –temperature, relative humidity and CO2regulator.. 32
10.1.9. STRP485-102 –temperature, relative humidity and barometric pressure
regulator................................................................................................................................ 32
10.1.10. STRP485-104 - temperature, relative humidity and Barometric
pressure regulator .............................................................................................................. 32

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10.1.11. Relative humidity and temperature restriction ....................................... 33
10.1.12. Value computed from measured relative humidity and temperature33
10.2. Operating conditions ..................................................................................................... 34
10.3. End of operation............................................................................................................. 35
10.4. Technical support and service..................................................................................... 36
11. Appendix A ...................................................................................................................... 36
12. Appendix B...................................................................................................................... 37

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General safety rules
The following summary is designed to prevent injury hazards or device damage. Operate the
instrument in accordance with this manual to prevent electric trauma.
Service should be performed by a qualified person only.
Use a safety ac/dc adapter. Use only an adapter with the power voltage recommended by its
manufacturer and which is approved by proper standards. Check that the adapter has
undamaged cables and cover.
Connect and disconnect correctly. Do not connect and disconnect a lead-in cables if the device is
under electric voltage.
Do not use the instrument without the cover.
Do not use the instrument, if it does not work correctly. If the instrument seems not to work
correctly, have it checked by a qualified service person.
Do not use the instrument in an explosive environment.
Read instruction manual before the first device connection, please.
Before you remove probe of the transmitter HxxxxP, make sure that the pressure in a
pressure chamber (duct, pipe … ) and the ambient pressure are in equilibrium.

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1. General description
Regulators are designed for online monitoring of temperature (°C or °F), relative humidity and
barometric pressure or carbon dioxide concentration. Some types contain three binary inputs for
detection of binary signals too (see table below). Measured temperature and relative humidity are
recomputed to following humidity expression: dew point temperature, absolute humidity, specific
humidity, mixing ratio and specific enthalpy. It is possible to set correction for altitude (pressure
offset) and to choose one of the following pressure units: hPa, kPa, mbar, mmHg, inHg, inH2O,
PSI, oz/in2.
The device is equipped with two relay outputs for alarming or controlling of external devices.
It is possible to assign any input value to each relay, to set comparing limit, delay, hysteresis,
acoustic alarm or change its status by far control with using of Modbus communication protocol.
The device communicates via link RS485.
The regulators are designed to be operated in a chemically non-aggressive environment.
Type
Temperature
Humidity
Pressure
CO2
Computed value
Binary inputs
ST485-101

-
-
-
-
3x
STR485-102


-
-

3x
STR485-104


-
-

3x
STR485-
104S*/


-
-

3x
STR485-103


-
-

3x
ST485-101E
**/

-
-
-
-
3x
AT-VLS-
101DRS
-
-
-

-
-
AT-VLS-
102DRS


-


-
STRP485-
102



-

3x
STRP485-
104



-

3x
*/ The removable probe for compressed air measurement is noninterchangeable part of the device.
The protection of connector is IP67
**/ The type ST485-101E is designed for two wires connection of external Pt1000 temperature sensor.
Supported communication protocols are Modbus RTU and protocol compatible with standard
Advantech-ADAM. Devices are preset from manufacturer to Modbus RTU communication
protocol. If you would like to use different communication protocol then Modbus RTU, it is
necessary preset them –see latter. Temperature, relative humidity and pressure sensors are non-
removable instrument parts except ST485-101E device, that is designed for two wires connection
of external Pt1000 temperature sensor. Measured and computed values are displayed on dual line
LCD. It is also possible to display both readings with cyclic overwriting in 4 seconds interval.
Display can be also switched OFF totally.

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2. Regulator mounting and connection
Regulators are designed for wall mounting. Device must be mounted on the plane surface to
prevent its deformation. Mounting holes and connection terminals are accessible after demounting
of four screws in the corners of the box and removing the lid. There is recommended to use screws
with half round head with cross-recessed screw ST 3.9 (DIN 7981). Lace the lead-in cable with
outer diameter of 3 to 6.5 mm through the glands at the case wall and connect them according
schematic below. 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. Insert attached plug into
unused cable glands too. Do NOT connect the regulator under voltage.
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.
External temperature probe connectable to
regulator must be type of “two wires with
shielding”. The probe cable length and size of
conductor affects measurement accuracy.
If connected probe is equipped with metal
stem, we recommend using probes with metal
stem not connected to cable shielding. Or else it
is necessary to arrange metal stem is not
connected to any other circuitry. Maximum
probe cable length is 10 m. Connect probe cable
shielding to proper terminal and do not connect
it to any other circuitry and do not ground it.
The cables for binary inputs and external
sensor for regulator must be placed as far as
possible from potential interference sources.
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 regulator connection must be from
3 to 6.5 mm. Suitable cable is e.g. SYKFY 2x2x0.5 mm2, where one wire pair serves for device
powering and the other pair for communication link. 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 be done only by a worker with required qualification by rules in
operation.
The device STR485-104S is 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 B.

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3. Typical application wiring, connection of terminals
Binary inputs are not galvanic isolated, connection terminals
+U are internally connected to the device power supply (ie. the
+U terminals provide the same voltage level as power supply).
4. Dimensions
ST485-101

8
STR485-103
STR485-102
STRP485-102

9
ST485-101E
STR485-104(P)
STRP485-104
Probe for compressed
air measurement

10
AT-VLS-101DRS
AT-VLS-102DRS
5. Description of device function and setting
Information from regulator is available directly through LCD or you can read them with one of
next communication protocols ( Modbus RTU, Advantech-ADAM ).