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Device manual 6490B / 6490B-y / 6590B
W. Bälz & Sohn GmbH & Co. Koepffstraße 5 D-74076 Heilbronn Telefon (07131) 1500-0 Telefax (07131) 1500-21
3.7.1 Alarm type selection for alarm relay AL.1
The alarm relay operates on the base of the idle current principle.
AL.1 = 0: no alarm selected
also not in case of sensor failure, see also 3.18 SE.b
AL.1 = 1: selects Al.A alarm type A (see description 3.7a)
Setting range: 0 to ± scope of the measuring range [phys. units]
Alarm hysteresis HY.1 for A1.A
Setting range: 0 to 10th part of the scope of the measuring range [phys. units]
0 to + scope of the measuring range [phys. units] at dP = 3
AL.1 = 2: selects Al.b alarm type B (see description 3.7b)
Setting range: measuring range [phys. units]
Alarm hysteresis HY.1 for A1.b
Setting range: 0 to 10th part of the scope of the measuring range [phys. units]
0 to + scope of the measuring range [phys. units] at dP = 3
AL.1 = 3: selects Al.C and Al.C. alarm type C (see description 3.7c)
Lower half of the band around the setpoint (negative setting)
Setting range: 0 to - scope of the measuring range [phys. units]
Alarm hysteresis HY.1 for A1.C
Setting range: 0 to 10th part of the scope of the measuring range [phys. units]
0 to + scope of the measuring range [phys. units] at dP = 3
Upper half of the band around the setpoint (positive setting)
Setting range: 0 to + scope of the measuring range [phys. units]
Alarm hysteresis HY.1. for A1.C.
Setting range: 0 to 10th part of the scope of the measuring range [phys. units]
0 to + scope of the measuring range [phys. units]at dP = 3
AL.1 = 4: selects A1.b alarm type B, version 2 (see description 3.7b)
Setting range: measuring range [phys. units]
Alarm hysteresis HY.1 for A1.b
Setting range: 0 to 10th part of the scope of the measuring range [phys. units]
0 to + scope of the measuring range [phys. units] at dP = 3
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