Type:Logic ICs
Condition:New
Model:PD3065-X
No.:1
Color classification:K, S, N, T, J, E, B, R
Decoration and construction contents:Hydropower project
OneSummary
Main characteristics
The interface is fully protected, accidentally touching the 24V, and even 220V communication, will not be damaged.
Communication, collection, power supply, the three part is completely isolated.
Be based on RS485 InterfaceModbus Protocol temperature acquisition module.
Supports all types of thermocouples currently used8slice18Bit height performanceADmeasure8Two channels, hardware and hardware filtering, data stabilization.
Measuring range: range of temperature that thermocouples can measure. Support broken line detection function. Resolving power0.1C.
Input impedance: greater than2MThe input interface has protection function.
Cold end compensation:UseLM75AorTCN75AHigh precision cold junction compensation, cold end resolution0.125CAccuracy:
Accuracy: measuring temperature range +0.5C.
quarantineRS485Interface support Modbus-RTU Agreement
The temperature calculation is completed inside the module, and the temperature value can be read directly. The unit is centigrade.
Wide working voltage:DC8V-30VThe power supply connection does not work. The original MC34063A switch power supply can work normally within 30V,
Outline size:88*72*59 standard35mmInstallation way of guide rail.
Operating temperature:-35C ~+50C.
Applications: liquid and gas temperature measurements.
Knowledge about cold end compensation
Law of intermediate temperature
The thermoelectric power between the two contacts of the thermocouple circuit (temperature is T, T0) is equal to the thermoelectric potential of the thermocouple at T and Tn, and at the temperature of Tn and T0
The algebraic sum of the thermoelectric potential. Tn says intermediate temperature.
Application: due to the nonlinear relationship between thermocouple E-T, when the temperature of the cold end is not 0 degrees, the actual thermoelectric potential E (T, t0) of the known circuit can not be used directly
Look-up table to get the temperature of the hot end; also can not use the known circuit actual thermoelectric potential E (T, t0) directly look-up table to obtain the temperature value,It needs to be corrected by the intermediate temperature law.
The law Eab (t1,0) = Eab (T1, t0) +Eab (t0,0)
For example: K thermocouple, when the work of free end t0=30 degrees centigrade, this measured thermoelectric potential of 38.560mv, seeking the temperature of the work end
Known Eab (T1, t0) =38.560mv
1: look-up table t0=30 temperature equivalent potential Eab (t0,0) =1.203mv
2: the final result is Eab (t1,0) = Eab (T1, t0), +Eab (t0,0), =38.560 + 1.203, =39.763mv
3: check table temperature equivalent to 962 degrees
2 pictures and interfaces
A:RS485 Serial communication A
B:RS485 Serial communication B
Power SupplyV+DC power positive
Power SupplyGNDDC power supply, negative pole, common end
TD (+ n)Sensor positive
TD (n) -Sensor negative
NotesTemperature value is 2 A signed integer of 0 bytes, the actual temperature 10 Times value. The unit is centigrade.
Test software interface
20H-27H is the temperature value compensated by the cold junction of 1-8 luke.
28H-2FH is the 1-8 way temperature value without cold junction compensation. The register 30H is the module cold end temperature value.
Modscan32test Symbolic integer register
Modbuss pooltest Symbolic integer register
