Burkert GENERIC 8400, Operating Instructions Manual

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24
Adjustment and functionalities
DELT DELT
DELT DELT
0
1
T° corresponding to a 4 mA input
current
Min. commutation range
Lower relay threshold (OLO)
Hysteresis (= 2x DELT)
Upper relay threshold (OHI)
Max. commutation range
T° corresponding to a 20 mA input current
Relay thresholds
external setpoint 4...20 mA
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 ).
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Type 8400