Threshold Detector / Transmitter Functions - bürkert 8400 Bedienungsanleitung

4-20 mA input
20
12
4
10
1
0
0
Fig. 21: Example of parameter settings for the 4-20 mA input
In the example in Fig. 21, a current of 12 mA sent by the controller is
converted by the transmitter into 50°C.
Based on this value, the transmitter calculates the low and high relay
commutation thresholds using the difference, DELT. In the example
in Fig. 21,
OLO (low threshold) = 50 - DELT = 50 - 10 = 40 °C
OHI (high threshold) = 50 + DELT = 50 + 10 = 60 °C
24
T°
50
90
Relay
OLO OHI 100
thresholds
Hysteresis
english
Type 8400
Adjustmentandfunctionalities
9.4. Threshold detector / transmitter
functions
The 8400 threshold detector / transmitter has 3 operating modes:
Read mode, Calibration mode and Simulation mode.
Mode Functions
Read To read out:
- the temperature measured
- the commutation thresholds
- the value of the 4-20 mA out-
put (transmitter only)
Calibration To make the settings needed for
operation:
- unit
- transistor or relay output
- filter
- bar graph
- temperature adjustment
- 4-20 mA current output
(transmitter only)
- 4-20 mA current input
(transmitter only)
Accessing the
other modes
• Calibration
• Simulation
• Read