Function group
RELAYS
RELAY 1
ON-VALUE
If you have configured Relay 1 for “FLOW DIRECTION” or “LIMIT FLOWRATE”,
you may determine the necessary switching points in these functions.
RELAY 1
OFF-VALUE
Relay 1 → “FLOW DIRECTION”
The value entered in this function defines the switch-on point for the positive
and
negative flow direction.
Detection of the flow direction operates with a hysteresis determined by the
switch point. If the switch point entered is for example = 1 dm
3
/min, then the
relay de-energises at –1 dm
3
/min and energises again at +1 dm
3
/min.
If a direct switchover is required (no hysteresis), then set the switch point to
the value “0”.
If creep suppression is activated, then it is recommended that the hysteresis is
set to a value larger or the same as the low flow cutoff.
Relay 1 → “LIMIT FLOWRATE 1”
The relay switches over as soon as the actual flow rate is above or below a
defined switch point (see Figure).
Note!
If you intend to use the limit function to detect when the measuring range has
been exceeded (v ≥ 12,5 m/s), then proceed as follows:
→ Set the switch on and switch off point to the maximum possible value.
→ Press the
5
key until the message “LIMIT REACHED” appears on the display.
The relay is dead as soon as the max. permissible measuring range is
exceeded.
6
5-digit number with floating decimal point (e.g. 1.0000 dm
3
/min)
7
UNIT ==> FLOW RATE UNIT
Unit selection → see “FLOW RATE UNIT” function
-1 0 +1
a
b
-Q
+Q
forwardreverse
a → Relay energised (live)
b → Relay de-energised (dead)
ba009y71
t
Min. safety
Switch on > switch off point
Max. safety
Switch on ≤ switch off point
Relay de-energised
(dead)
ba009y70
Q
OFF
ON
OFF
ON
Note!
Promag 33 6 Description of Functions
Endress+Hauser 59
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