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A70H TL P Photo 10092019

 

 

 

 

 

The A70H-TL-P is a precision thermistor temperature sensor. The sensor is compact and easy to install, with good linear response, strong load capacity, long transmission distance and resistance to interference.

 

Item

Technical Specifications

 

Range

 -50oC - +100oC, -20oC - +50oC

Accuracy

 +/- 0.5oC

Supply

12 - 24VDC

Output Signal

4-20mA; 0-5V, RS485(MODBUS), PT100/PT1000

Load Capacity

4-20mA  ≤250Ω, 0-5V ≥1K

Operating Temperature

 Sensor-50oC - +100oC, Transmitter -20oC - +50oC

Ingress Protection

IP65/NEMA4

Transmitter Dimension

25 x 150mm

Weight (unpacked)

460g/1.02lb

Materials

ABS

Note: This product has been tested and complies with European CE requirements for EMC directive.

Installation
Use the supplied thermally conductive adhesive to attach the sensor housing to the surface to be measured.  The transmitter housing should be contained within an area that will not exceed the recommended temperature range of -20 to +50°C.

Wiring

Electrical Connections

Cable

Voltage

Current

RS485

Red

V+

V+

V+

Grn/Blk

V-

V-

V-

Yellow

Signal Out

Signal Out

RS485A

Blue

   

RS485B

 

Output Characteristics

Current
Characteristic Transfer Function
T=(I-4)/(20-4) *Scale range + offset

(where T – temperature (oC), I = output current (mA)), offset = range start point

Example:             (11.5mA – 4mA)/(20mA – 4mA) * 150°C + (-50°C) = 20.3°C

Voltage
Characteristic Transfer Function
T=U/(full scale voltage-zero point voltage) *Scale range
(where T = temperature (oC), U = output voltage (V)

RS485
If the transmission distance is over 100m, add one 120Ω terminal matching resistance on the front end and back end of bus interface respectively.

Communication Protocol (MODBUS)
Transmission mode: MODBUS-RTU, Baud rate: 9600bps, Data bits: 8, Stop bit: 1, Check bit: no
Slave address: factory default is01H (set according to need, 00H, FFH)

The 03H Function Code Example: Read the Temperature
Host Scan Order (slave address: 0x01)
01 03 00 00 00 01 840A

Slave Response
01 03 02 00 B4 B833

Temperature:(00B4)H=(180)D,180/10=18(oC)

The 10H Function Code Example: Modify the slave address
Host Scan Order (Changed to 01H, read and write address must be 00H):
00 10 01 BDC0

Slave Response:
00 10 007C

The 20H Function Code Example: Read the Slave Address (fixed command, ensure that no other devise are on the bus)
Host Scan Order:
00 20 00 68

Slave Response (addr.=01H):
00 20 01  A9C0

*Note: All underlined are fixed bits;
The last two bytes are CRC check command.

 

 

 

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