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Device Functions Proline Promag 55
10 Block SPECIAL FUNCTION
Hauser
133
10.1.3
Function group CONFIG. COATING
SPECIAL FUNCTION
H
⇒
ADV. DIAGNOSTICS
HEA
⇒
CONFIGURATION
750
⇓
ACQUISITION
751
⇓
CONFIG. COATING
752
Function description
SPECIAL FUNCTION
➞
ADV. DIAGNOSTICS
➞
CONFIG. COATING
COATING DETECTION
(7520)
The coating detection (= detecting build-up on the measuring electrodes) can be
switched on in this function.
Options:
OFF
ON
Factory setting:
OFF
COATING VOLTAGE
(7521)
The extent of the voltage pulse required for the coating detection (U
B
, Fig. 1) is entered
in this function.
User input:
0.1 to 6 V(olt)
Factory setting:
3 V
PULSE DURATION
(7522)
The pulse width (t
P
, Fig. 1) for measuring the decay time constant is entered in this
function.
User input:
0.1 to 10 ms
Factory setting:
1 ms
RECOVERY TIME
(7523)
In this function, a recovery time (t
E
, Fig. 1) for the decay of the test pulse is specified,
while the last – before coating detection –
measured flow rate value is
retained. It is
necessary to enter a recovery time because the pulse (for coating detection) can cause the
signal outputs to fluctuate due to electrochemical interference voltages.
User input:
0.1 to 100 s
Factory setting:
10 s
"
Caution!
• During the recovery time, the measuring device outputs the last flow rate value
measured before coating detection. This in turn means that the measuring system does
not register changes in flow, e.g. zero flow, during this time span.
• If the value entered for the recovery time is too small, then the measuring device
generates the error message "COATING FAILED" (# 845).
Содержание Proline Promag 55
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