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

3
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

4
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.

5
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.

6
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.

7
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 ).

11
5.1. Device setting from the manufacturer
If special setting was not required in the order, regulator is set from the manufacturer to the
following parameters:
communication protocol: Modbus RTU
regulator address: 1
communication speed: 9600Bd, no parity, 2 stop bits
Value assigned to relay 1 and relay 2: none
Password for setting through keys (PASS): 0000
LCD display: on
value shown at first LCD line: temperature, temperature / pressure, CO2,
temperature / CO2–by device type
value shown at second LCD line: relative humidity / dew point temperature
temperature unit: °C
pressure unit: hPa
correction for altitude: 0 hPa (absolute pressure)
computed value preset: dew point temperature
relay response for error: stay unchanged at previous condition
signalization of binary inputs status: LED diode lights if input contact is open
acoustic alarm: off
LED indication of CO2concentration up to 1000 ppm lights green LED, between 1000 and
1200 ppm lights yellow LED and over 1200 ppm lights
red LED
5.2. Relay outputs
Regulator is equipped with two relay outputs. It is possible to assign any input or computed
value or “Far condition” (see chapter 6.1.4 Far controlling of output relays status at
page 24) to each relay, to set comparing alarm limit, if the relay may close if measured value is
higher (Hi) or lower (Lo) than preset limit, delay for while must be preset condition true before
relay close its contact and hysteresis for return to open status. For binary inputs: if it is preset to
„HI“ then output relay is closed when input contact is opened, if it is preset to „Lo“ then output
relay is closed when input contact is closed. Each relay status is indicated with LED diode and
shown on LCD with corresponding symbols „ “ or „ “.
The output relays of device are not able to switch power circuits or higher voltages. In such
case we should use suitable type of power relays with coil in accordance to chapter “Common
parameters”. For wiring see Appendix A.
5.3. Binary inputs
It is possible to read three binary inputs status. It is possible to connect “open contact” or
external voltage. Auxiliary power supply +U terminal can be used to supplying of external sensors
and detectors. Visualization of binary inputs is done by three LED diodes placed on the left side
from LCD. Green one represents input Binary 1, yellow input binary 2 and red input binary 3. If
binary input is not connected or is without any signal, then binary input is interpreted as „1“, when
input contact is closed (connected input), then binary input is interpreted as „0“. For each binary
input there is possible to set indication LED function –if is lighting when binary input is closed or
opened. Binary input status can be assigned to any of output relays. It is possible to choice if
output relay is closed or opened when binary input is closed/opened.

12
5.4. Carbon dioxide concentration measurement
Device measurement principle is based on Non-Dispersive Infrared Technology (NDIR). It is
maintenance free because of the patented autocalibration feature, compensating for the effects of
aging and therefore a guarantee for outstanding long-term stability. If the device is in operation
permanently, an auto-adjustment will start automatically after 24 hours operation each.
Measured values can be read in „SLOW mode“ (filtered, averaged) or in „FAST mode“ (current
values without averaging). SLOW mode has advantages in applications like climate control
because of filtering short time peaks. As an example exhaled air from an employee passing the
sensor could affect the climate control negatively with a short response time because the control
would trigger a change of the ventilation based on this one-time measurement.
On the left LCD side there are placed three LEDs for CO2zone level indication. Parameter
setting description is into chapter 5.6 Regulator setting change at page 14. After power up there is
internal check in progress and takes about 20s. During this time LCD display shows (----) instead of
CO2 concentration value.
5.5. Actual regulator preset
It is possible to display actual regulator preset on its LCD display by
pressing of „“ key. . If „Output relay alarm condition configuration with
using of Modbus communication protocol“ is active (Remote Control), then
device’s LCD display shows text „bloc“. It means, device’s keyboard is
disabled for time of remote control (setting change), see chapter 6.1.5 at
page 25. LCD shows information about relay 1 and then relay 2 setting step
by step. Information about relay 1 are indicated with symbol „ “, for relay 2 with symbol
„ “ (at right top corner of LCD). It is possible to edit parameters after pressing „SET“
key and entering of correct password „PASS“ –see chapter 5.7 at page 15. Following examples
are for relay 1 setting, similarly are displayed values for relay 2. Pressing of „ESC“ key ends this
mode and switch to actual value displaying, the same occur if more than 20 s is not pressed any
key.
5.5.1. Value assigned to output relay
None, relay is still off
Temperature at °C
Relative humidity
Computed value –dew point
temperature
Barometric pressure
CO2

13
Binary input 1, input 2 and 3
similarly
far condition 0
far condition 1
FAR0 –„far condition 0“: after device’s power on the relay is open
FAR1 –„far condition 1“: after device’s power on the relay is close
If “far condition” is assigned to output relay, then there is possible to change the output relay status
by Modbus communication protocol only. See chapter 6.1.4 Far controlling of output relays status
at page 24
5.5.2. When close output relay
Preset if relay is closed when actual value is higher „HI“ or lower „Lo“ than preset value.
Value higher than 26.5 °C
Value lower than 26.5 °C
5.5.3. Delay
Time in seconds, when preset condition must be true and after this time output relay is closed
(transient reduction of measured value)
Delay in [s]

14
5.5.4. Hysteresis
The amount of measured value which must go under/over preset value to open appropriate
output relay. It means if there is condition: relay 1 must be closed if measure value is “higher then”
(HI), then measured value must decrease by this value under preset limit to relay output goes open.
If condition of relay is: relay 1 must be closed if measured value is “lower than” (Lo), then
measured value must be increased by this value over preset limit to relay output goes open.
Preset hysteresis value
5.5.5. Regulator address setting
Regulator address for preset communication protocol
RS485 network regulator address
5.6. Regulator setting change
5.6.1. Setting with PC and TSensor software
User’s software TSensor is available free to download at web page www.atal.nl. It provides
setting of all regulator parameters. Run the TSensor program and follow the program
instructions. Regulator includes hardware write protection of internal setting , new setting is
possible to write only while:
1. during write period press „SET“ key – do requested setting in TSensor software, press
„SET“ key on regulator and keep it down, then click on the button „Save Changes“ into
TSensor software and after end of write release „SET“ key, or
2. jumper placed nearby keys is closed (jumper is accessible after demounting of four screws in
the corners of the box and removing the lid ). This jumper is suitable e.g. until device
adjustment is in process and regulator is placed into calibration box and keys are not
accessible. Don’t forget to remove (open) jumper after procedure finish (restore write
protection)
TSensor software supports to make the adjustment of the regulator too.

15
5.6.2. Setting with using regulator keys
If „Actual regulator preset” is displayed (see chapter “Actual regulator preset” at page 12), it is
possible to enter into edit mode and edit displayed value by pressing „SET“ key. Then you are
asked for valid password (PASS). You can edit selected value if right password is entered. During
value editing there is range check executed and edited value is still compared with limits for
corresponding value (range). If inserted value is higher or lower then edited number is
automatically changed to its maximum / minimum value –for possible range see chapter
„Technical parameters“ at page 29. Value can be changed with using „“ and „“ keys.
Edited value is switched in “round” -9, -8, -7, …-2, -1, 0, 1, 2, …8, 9. To edit next number digit
press „SET“ key, for moving back to previous digit press „ESC“ key. Edited value is stored by
next „SET“ key pressing. It is possible to cancel editing by pressing „ESC“ key if necessary. If
valid password is once inserted right, then there is possible to edit next items without asking for
password insertion again, till “Actual regulator preset” is left (till actual measured values are
shown). With new entering into edit mode it is necessary to enter Password again. Default
password setting is preset from manufacturer to 0000, password change is possible into „Extended
setting”. During edit mode regulator still works and changes are valid immediately after its storing
–it is NOT necessary to restart regulator.
5.6.3. Setting with using of Modbus communication protocol
See chapter 6.1.5 Output relay alarm condition configuration with using of Modbus
communication protocol 2at page 25.
5.7. Extended setting mode
During regulator operation it is possible to change parameters available through “Actual
regulator preset” only (see chapter 5.5 at page 12). Rest of regulator parameters are available
through “Extended setting mode”. In this mode regulator does NOT communicate, does
NOT do any measurements and does NOT service output relays. To leave this mode press
„ESC“ key and open jumper nearby keys.
To enter into Extended setting mode do following steps:
1. disconnect power supply
2. demount four screws in the corners of the box and remove the lid
3. closed jumper placed nearby keys
4. press „“ and „“ keys together and keep them down
5. connect power supply to regulator –you should see message „SEL“ on the top line of LCD
and on the bottom line you should see number of Firmware version (e.g. 0404)
6. release „“ and „“ keys – you are into “Extended setting mode” now
Use „“ and „“ keys to inspect each items. If you want to change some shown item then
press „SET“ key, item starts blink. Now you can edit setting with using „“ and „“ keys. To
store preset value press „SET“ key. Press „ESC“ key to leave editing (changing) without save –
last stored value is kept.
Acoustic alarm assign to relay 1
acoustic indication of relay 1 is OFF
close of relay 1 contact starts acoustic
indication

16
Acoustic alarm assign to relay 2
acoustic indication of relay 2 is OFF
close of relay 2 contact starts acoustic
indication
Acoustic alarm deactivation
activated acoustic alarm is possible to
deactivate by pressing „ESC“ key
acoustic alarm is still activated for all time and
it is impossible to deactivate it
Relay response for error
Regulator continuously checks its state during operation. In case error of assigned value
measurement is found then output relay 1 (relay 2):
stays unchanged (in previous
status)
relay 1 switch OFF
relay 1 switch On
stays unchanged (in previous
status)
Relay 2 switch OFF
Relay 2 switch On

17
Change of “Password for setting through keys” (PASS)
This item shows actual password setting. It is possible to
change it after „SET“ key pressing. It is number from range -
19999 to +19999
Choice of communication protocol
Choice of communication protocol for communication with master device
protocol Modbus
protocol Advantech-Adam
without check sum
protocol Advantech-Adam
with check sum
Regulator address setting
Regulator address for preset communication protocol
RS485 network regulator address
Communication speed
Communication speed for preset communication protocol
communication speed setting
Visualization of binary inputs
Visualization of inputs is done by three LED diodes. This option defines at which binary input
status should LED diode indication lights –LED diode lights if binary input is OPEN or CLOSED.
LED lights if binary input is OPEN
LED lights if binary input is CLOSED
password setting

18
Binary input 1
Binary input 2
Binary input 3
Temperature unit choice
It is possible to measure temperature at °C or °F. There is shown preset unit. It is possible to
change it after „SET“ key pressing.
preset to °C
preset to °F
Barometric pressure unit choice
It is possible to measure barometric pressure at hPa, PSI, inHg, mBar, oz/in2, mmHg, inH2O
and kPa. There is shown preset unit. It is possible to change it after „SET“ key pressing.
preset to hPa
preset to PSI
preset to inHg
preset to mBar
preset to oz/in2
preset to mmHg
preset to inH2O
preset to kPa

19
Setting of pressure correction for altitude
If is there necessary to read value of barometric pressure corrected with respect to altitude, it is
possible to set corresponding pressure offset for this altitude. It is possible to change it after “SET”
key pressing. Pressure correction value is then automatically added to measured pressure value.
See chapter “Error States of the device” at page 27, Error 2.
correction for altitude
pressure correction value is from
-25,0 to 650,0 hPa
-0,363 to 9,427 PSI
-0,74 to 9,19 inHg
-25,0 to 650,0 mBar
-5,8 to 150,8 oz/in2
-18,8 to 487,5 mmHg
-10,0 to 261,0 inH2O
-2,5 to 65 kPa
CO2measurement mode selection
This item provides to choice if measured value is displayed and read in “SLOW” or “FAST”
mode. “FAST” mode provides last measured value without averaging; this means that no software
filter is used for calculating the output value. This fact adds a noise of typ. ±30ppm which has to
be considered in terms of accuracy. “SLOW” mode provides value averaged from last 11 “FAST”
measured values.
averaged value „SLOW“ mode
current value without averaging „FAST“ mode
CO2zone level indication setup
Up to 1000 ppm lights green LED, between 1000 and 1200 ppm lights
yellow LED and over 1200 ppm lights red LED.
Whole measuring range can be divided into three areas. Each
active area there is indicated by green, yellow or red LED depends
on actual measured value. It is done by two boundary limits setting.
„YELL“ limit sets boundary between green and yellow indication. It
means that if actual measured value is lower than „YELL“ limit, there is green LED active. If
actual measured value is higher than „YELL“ limit, then there is yellow LED active. Yellow LED
lights until actual measured value exceeds „RED“ limit. If actual value is higher than „RED“ limit,
red LED is active. If you don’t want to use this indication then set “YELL” limit to 0.
.
„YELLOW“ limit setting
„RED“ limit setting

20
Show temperature at LCD display
This item provides to choice if actual measured temperature may be displayed at LCD display
or not. It is possible to change it after „SET“ key pressing.
show value on LCD
don’t show value on LCD
Show relative humidity at LCD display
This item provides to choice if actual measured relative humidity may be displayed at LCD
display or not. It is possible to change it after „SET“ key pressing.
show value on LCD
don’t show value on LCD
Show computed value at LCD display
This item provides to choice if actual computed value may be displayed at LCD display or not.
There is shown the name of computed value on the top LCD line –see “Computed value selection“
below. It is possible to change it after „SET“ key pressing.
show value on LCD
don’t show value on LCD
Show barometric pressure at LCD display
This item provides to choice if actual barometric pressure may be displayed at LCD display or
not. It is possible to change it after „SET“ key pressing.
show value on LCD
don’t show value on LCD