4 Temperature Measurement Module DVP 04PT-E2
4.1 The Basic Concept of Platinum Temperature Sensor
Platinum temperature sensor is highly accurate and stable and the quality of linearity between -200°C and 600°C is
fairly good. Take PT100 for example. Generally the temperature coefficient of PT100 temperature sensor is more
significant at low temperature -200°C ~ -100°C while it becomes small at high temperature, i.e. 300°C ~ 500°C. In
addition, the quality of linearity is good at middle temperature 100°C ~ 300°C. The resistance of PT100 is 100 at
0°C, which is taken as the standard for a metallic temperature sensor.
In order to reduce self-heating, a working current that is too big should be avoided in the application of PT100
temperature sensor. Generally we confine the rated current to be below 2mA. The self-heating of 1mW on PT100 will
cause a temperature variation of 0.02°C ~ 0.75°C. Reducing the current through PT100 will reduce the temperature
variation as well. However, if the current is too small, PT100 will be interfered by noise easily. Therefore, it is
appropriate to confine the current between 0.5mA and 2mA.
4.2 Introduction
DVP04PT-E2 temperature measurement module is able to receive 4 points of platinum temperature sensors (PT100
3-WIRE 100 3850 PPM/°C (DIN 43760 JIS C1604-1989)/ NI100 / PT1000 / NI1000) and convert them into 16-bit
digital signals. The data in DVP04PT can be read/written by using FROM/TO instructions or D9900 ~ D9999 in the
program of DVP-PLC MPU. You can select the temperature to be displayed in Celsius (°C) or Fahrenheit (°F).
Resolution of temperature in Celsius: 0.1°C and in Fahrenheit: 0.18°F.
4.3 Product Profile and Outline
4.3.1 DVP04PT-E2
70
62
106
98
78
90
61.5
2
1
4
5
9
6
6
7
7
8
8
3
+ + + ++ +
++
Unit: mm 1
1. Connection port for extension unit/module 6. Terminals
2. DIN rail (35mm) 7. Mounting hole
3. Model name 8. Fixing clip for extension unit/module
4. POWER, ERROR, AD indicators 9. Mounting port for extension unit/module
5. DIN rail clip
I/O terminals
+
O1
+
I1 FEI1
+
O2 FEO3I2I2
+
FE
+
I3
+
I3
0V24V FE
+
O4 I4
+
I4 FE
DVP-ES2 Module Manual
-1
To Next Page
Loading...
Need help?
General
