Operational Example Of The 4 - bürkert 8400 Bedienungsanleitung

T° corresponding to a 4 mA input
Min. commutation range
1
0
Lower relay threshold (OLO)
Fig. 18: Operational diagram of the 4...20 mA input
9.3.3. Operational example of the 4...20 mA input
In the example in Fig. 19:
- the commutation range is 0 °C...100 °C
- the hysteresis is 20
- DELT is equal to hysteresis/2 so DELT = 10 °C.
→ Calculating the temperature corresponding to an input current of 4 mA: Min. commutation range + DELT = 0 + 10 = 10 °C
→ Calculating the temperature corresponding to an input current of 20 mA: Max. commutation range - DELT = 100 − 10 = 90 °C
→ Set the transmitter parameters with the temperatures calculated (see chapter 9.7).
24
current
external setpoint 4...20 mA
DELT DELT
DELT
Hysteresis (= 2x DELT)
english
T° corresponding to a 20 mA input current
Max. commutation range
DELT
Upper relay threshold (OHI)
Type 8400
Adjustment and functionalities
Relay thresholds