Comptus A70H-HTP User manual

Instruction Manual
Pictured:
A70H-T
DOCUMENT VERSION:
210428
This Manual includes sections on:
A70H-T Atmospheric Temperature Sensor
A70H-T-S Atmospheric Temperature Sensor w/ Shield
A70H-HT Atmospheric Temperature and Humidity Sensor
A70H-HT-S Atmospheric Temperature and Humidity Sensor w/ Shield
A70H-HTP Atmospheric Temperature, Humidity and Pressure Sensor
A70H-HTP-S Atompsheric Temperature, Humidity and Pressure Sensor w/ Shield
COMPTUS.COM [email protected]OM [phone]
A70H-HTP Atmospheric Temperature Sensor

A70H-T & A70H-T-S
The A70H-T is a high sensitivity atmospheric temperature sensor. The sensor is in a single
IP65/NEMA4 UV protected casing. The available radiation shield is ABS plastic with
stainless steel mounting hardware.
FEATURES
-Available with Solar Radiation Shield (A70H-HT-S)
-Comes Standard as A70H-HT Sensor Only
APPLICATIONS
-Building Automation and Controls
-Environmental Monitoring
SPECIFICATIONS
Range: Humidity - 0-100% R.H.
Temperature - -40ºC to 60ºC
Resolution: Humidity - 0.5% R.H.
Temperature - 0.1ºC
Accuracy: Humidity - ±3% R.H.
Temperature - ±0.5ºC
Electrical: Power Supply - 12-24 VDC
Output Signal - 4-20 mA; 0-10V, RS485, I²C, SDI-12
Current Consumption - <20mA
Operating Temperature: -40ºC to 60ºC
Ingress Protection: IP65/NEMA4
Storage Conditions: 10ºC to 60ºC @ 20% to 90% R.H.
Weight:120g / 4.2 oz (With Shield, 730g / 1.6 lbs)
Materials: ABS, Aluminum, Stainless Steel
Radiaiton Shield Dimensions: 7”D x 12”H
COMPTUS.COM [e-mail] [phone]
A70H-HTP Atmospheric Temperature Sensor

INSTALLATION:
Install the product in a stable environment, away from articial heating and cooling devices and avoiding
direct sunlight if possible. Use the supplied U-bolts to attach the angled mount to a vertical pipe or stan-
chion that is approximately 2” in diameter. The Comptus logo should be angled towards the ground with the
mounting plane for the radiation shield horizontal above the U-bolts. The angled mount can also be directly
attached to a vertical face with screws or bolts.
Slide the free end of the sensor probe into the large cable gland on the bottom of the radiation shield until
the sensor probe is one third to one half of the way into the radiation shield. Stop before you get to the hex
of the gland nut that holds the black cable. Tighten down the large cable gland on the bottom of the radia-
tion shield to lock the sensor probe in place.
Remove the cable ties from the coiled black cable and slide the free end (with wire leads) of the cable
through the large round hole in the mounting plane. Remove the three wing nuts from the radiation shield
and feed the black cable down until you can mount the three studs through the holes on the mounting
plane. Attach in place with the wing nuts from the underside of the mounting plane.
ELECTRICAL CONNECTIONS:
CABLE
RED
BLACK
YELLOW
BLUE
4-20 mA Output
V+
V-
Temp Current
Signal
N/A
RS485 Output
V+
V-
RS485 DA+
RS485 DB-
COMPTUS.COM [e-mail] [phone]
A70H-HTP Atmospheric Temperature Sensor

OUTPUT CHARACTERISTICS:
Current (4-20mA)
Temperature(˚C) = ((I-4)/16 * 100) – 40 where I = output current in mA.
RS485 Communications Protocol (MODBUS-RTU)
If the transmission distance is over 100m please add a 120-ohm termination resistor on the front and back
end of the bus interface respectively.
Communication parameters: Baud rate: 9600; Data bits:8; Stop bit:1; Parity: none
Slave address: factory default is FFH (set according to the need, 00H to FFH)
The 03H Function Code Example: Read the Atmospheric Temperature
Host Scan Order (slave address: 0xFF)
FF 03 00 00 00 01 91D4
Slave Response
FF 03 02 19AD 5BBD
Temperature: (19AD)H = (6573)D = (6573/100)-40 = 25.73˚C
The 10H Function Code Example: Modify the slave address (xed command, ensure that no other devices
are on the bus)
Host Scan Order (Changed to 33H):
00 10 00 01 00 01 02 00 33 EA04
Slave Response
00 10 00 01 00 01 51D8
The 03H Function code Example: Read the Slave Address (xed command, ensure that no other devices are
on the bus)
Host Scan Order:
00 03 00 01 00 01 D41B
Slave Response:
00 03 02 00 FF C5C4
Note:
All underlined is xed bit;
The last two bytes is CRC check command
COMPTUS.COM [e-mail] [phone]
A70H-HTP Atmospheric Temperature Sensor

A70H-HT & A70H-HT-S
The A70H-HT is a high sensitivity atmospheric humidity and temperature sensor. The
sensor is in a single IP65/NEMA4 UV protected casing. The available radiation shield is
ABS plastic with stainless steel mounting hardware.
FEATURES
-Available with Solar Radiation Shield (A70H-HT-S)
-Comes Standard as A70H-HT Sensor Only
APPLICATIONS
-Building Automation and Controls
-Environmental Monitoring
SPECIFICATIONS
Range: Humidity - 0-100% R.H.
Temperature - -40ºC to 60ºC
Resolution: Humidity - 0.5% R.H.
Temperature - 0.1ºC
Accuracy: Humidity - ±3% R.H.
Temperature - ±0.5ºC
Electrical: Power Supply - 12-24 VDC
Output Signal - 4-20 mA; 0-10V, RS485, I²C, SDI-12
Current Consumption - <20mA
Operating Temperature: -40ºC to 60ºC
Ingress Protection: IP65/NEMA4
Storage Conditions: 10ºC to 60ºC @ 20% to 90% R.H.
Weight:120g / 4.2 oz (With Shield, 730g / 1.6 lbs)
Materials: ABS, Aluminum, Stainless Steel
Radiaiton Shield Dimensions: 7”D x 12”H
COMPTUS.COM [email protected]OM [phone]
A70H-HTP Atmospheric Temperature Sensor

INSTALLATION:
Install the product in a stable environment, away from articial heating and cooling devices and avoiding
direct sunlight if possible. Use the supplied U-bolts to attach the angled mount to a vertical pipe or stan-
chion that is approximately 2” in diameter. The Comptus logo should be angled towards the ground with the
mounting plane for the radiation shield horizontal above the U-bolts. The angled mount can also be directly
attached to a vertical face with screws or bolts.
Slide the free end of the sensor probe into the large cable gland on the bottom of the radiation shield until
the sensor probe is one third to one half of the way into the radiation shield. Stop before you get to the hex
of the gland nut that holds the black cable. Tighten down the large cable gland on the bottom of the radia-
tion shield to lock the sensor probe in place.
Remove the cable ties from the coiled black cable and slide the free end (with wire leads) of the cable
through the large round hole in the mounting plane. Remove the three wing nuts from the radiation shield
and feed the black cable down until you can mount the three studs through the holes on the mounting
plane. Attach in place with the wing nuts from the underside of the mounting plane.
ELECTRICAL CONNECTIONS:
CABLE
RED
BLACK
YELLOW
BLUE
4-20 mA Output
V+
V-
Temp Current
Signal
Humidity Current
Signal
RS485 Output
V+
V-
RS485 DA+
RS485 DB-
COMPTUS.COM [e-mail] [phone]
A70H-HTP Atmospheric Temperature Sensor

OUTPUT CHARACTERISTICS:
Current (4-20mA)
T Temperature(˚C) = ((I-4)/16 * 100) – 40 where I = output current in mA.
H Humidity(%) = (I-4)/16 * 100% where I = output current in mA.
RS485 Communications Protocol (MODBUS-RTU)
If the transmission distance is over 100m please add a 120-ohm termination resistor on the front and back
end of the bus interface respectively.
Communication parameters: Baud rate: 9600; Data bits:8; Stop bit:1; Parity: none
Slave address: factory default is FFH (set according to the need, 00H to FFH)
The 03H Function Code Example: Read the Atmospheric Temperature & Humidity
Host Scan Order (slave address: 0xFF)
FF 03 00 00 00 02 D1D5
Slave Response
FF 03 04 19AD 1BE4 79FA
Temperature: (19AD)H = (6573)D = (6573/100)-40 = 25.73˚C
Humidity: (1BE4)H = (7140)D = 7140/100 = 71.40%
The 10H Function Code Example: Modify the slave address (xed command, ensure that no other devices
are on the bus)
Host Scan Order (Changed to 33H):
00 10 00 01 00 01 02 00 33 EA04
Slave Response:
00 10 00 01 00 01 51D8
The 03H Function code Example: Read the Slave Address (xed command, ensure that no other devices are
on the bus)
Host Scan Order:
00 03 00 01 00 01 D41B
Slave Response:
00 03 02 00 FF C5C4
Note:
All underlined is xed bit;
The last two bytes is CRC check command
COMPTUS.COM [e-mail] [phone]
A70H-HTP Atmospheric Temperature Sensor

A70H-HTP & A70H-HTP-S
The A70H-HTP-S is a high sensitivity atmospheric humidity, temperature and barometric
pressure sensor with radiation shield. The sensors are in a single IP65/NEMA4 UV protected
casing. The available radiation shield is ABS plastic with stainless steel mounting hardware.
The mounting bracket is supplied with two 2-1/4” U-bolts for mounting to a mast. The 4-wire
sensor cable is 10’ (3m) long. Connections are for V+, V-, data A and data B.
FEATURES
-Available with Solar Radiation Shield (A70H-HTP-S)
-Comes Standard as A70H-HTP Sensor Only
APPLICATIONS
-Building Automation and Controls
-Environmental Monitoring
SPECIFICATIONS
Range: Humidity - 0-100% R.H.
Temperature - -40ºC to 60ºC
Pressure - 10-110kPa (100-1100 mbar)
Resolution: Humidity - 0.5% R.H.
Temperature - 0.1ºC
Pressure - 0.1 mbar
Accuracy: Humidity - ±3% R.H.
Temperature - ±0.5ºC
Pressure - ±1 mbar
Electrical: Power Supply - 12-24 VDC
Output Signal - MODBUS RTU - RS485
Current Consumption - <20mA
Operating Temperature: -40ºC to 60ºC
Ingress Protection: IP65/NEMA4
Storage Conditions: 10ºC to 60ºC @ 20% to 90% R.H.
Weight:120g / 4.2 oz (With Shield, 730g / 1.6 lbs)
Materials: ABS, Aluminum, Stainless Steel
Radiaiton Shield Dimensions: 7”D x 12”H
COMPTUS.COM [e-mail] [phone]
A70H-HTP Atmospheric Temperature Sensor

INSTALLATION:
Install the product in a stable environment, away from articial heating and cooling devices and avoiding
direct sunlight if possible. Use the supplied U-bolts to attach the angled mount to a vertical pipe or stan-
chion that is approximately 2” in diameter. The Comptus logo should be angled towards the ground with the
mounting plane for the radiation shield horizontal above the U-bolts. The angled mount can also be directly
attached to a vertical face with screws or bolts.
Slide the free end of the sensor probe into the large cable gland on the bottom of the radiation shield until
the sensor probe is one third to one half of the way into the radiation shield. Stop before you get to the hex
of the gland nut that holds the black cable. Tighten down the large cable gland on the bottom of the radia-
tion shield to lock the sensor probe in place.
Remove the cable ties from the coiled black cable and slide the free end (with wire leads) of the cable
through the large round hole in the mounting plane. Remove the three wing nuts from the radiation shield
and feed the black cable down until you can mount the three studs through the holes on the mounting
plane. Attach in place with the wing nuts from the underside of the mounting plane
ELECTRICAL CONNECTIONS:
CABLE
RED
BLACK
YELLOW
BLUE
RS485 Output
V+
V-
RS485 DA+
RS485 DB-
COMPTUS.COM [e-mail] [phone]
A70H-HTP Atmospheric Temperature Sensor

OUTPUT CHARACTERISTICS:
RS485 Communications Protocol (MODBUS-RTU)
If the transmission distance is over 100m please add a 120-ohm termination resistor on the front and back
end of the bus interface respectively.
Communication parameters: Baud rate: 9600; Data bits:8; Stop bit:1; Parity: none
Slave address: factory default is FFH (set according to the need, 00H to FFH)
The 03H Function Code Example: Read the Atmospheric Temperature, Humidity and Barometric Pressure
Host Scan Order (slave address: 0xFF)
FF 03 00 00 00 03 1015
Slave Response
FF 03 06 19AD 1BE4 2715 5A2C
Temperature: (19AD)H = (6573)D = (6573/100)-40 = 25.73˚C
Humidity: (1BE4)H = (7140)D = (7140/100) = 71.40%
Pressure: (2715)H = (10005)D = (10005/100) = 100.05 kpa = 1000.5 mbar
The 10H Function Code Example: Modify the slave address (xed command, ensure that no other devices
are on the bus)
Host Scan Order (Changed to 33H):
00 10 00 01 00 01 02 00 33 EA04
Slave Response
00 10 00 01 00 01 51D8
The 03H Function code Example: Read the Slave Address (xed command, ensure that no other devices are
on the bus)
Host Scan Order:
00 03 00 01 00 01 D41B
Slave Response:
00 03 02 00 FF C5C4
Note:
All underlined is xed bit;
The last two bytes is CRC check command
Register Map: 40001 Temperature ˚C (value/100 – 40) i.e. 5923/100 - 40 = 19.23˚C
40002 Humidity % (value/100) i.e. 6055/100 = 60.55%
40003 Barometric pressure mbar (value/10) i.e. 9985/10 = 998.5 mbar
Specications subject to change without notice
Installation Questions and Troubleshooting
Contact [email protected]
Call [phone]
1307 NH Route 175
Campton, NH 03223
COMPTUS.COM [e-mail] [phone]
A70H-HTP Atmospheric Temperature Sensor