8.1.2 Option V220 - analog recorder output 0-10V
When option V220 is installed,
2240 PROcheck
will be equipped
with a galvanic separated voltage output.
The resolution of the output voltage is depending on sensor types in-
stalled and on the preset spread. During warm-up time and zero point
measuring the recorder output is set to 0 Volt. This corresponds to a
concentration of 0 g/m3, or 0 ppm. During actual measurement the
recorder output is being set prior to every pump cycle to that voltage
which corresponds to the actually measured concentration. If an
underflow of the measuring range occurs, the output is set to that
voltage which corresponds to the lower limit of the measuring range.
The pin assignment is identical to option V218.
See also fig. 11.
As a result of spreading the following values results:
Spreading 1:
The entire range is scaled on 0 Volt to 10 Volt.
Spreading 10:
A tenth of the entire range is scaled on 0 Volt to 10 Volt.
Spreading 100:
A hundredth of the entire range is scaled on 0 Volt to 10 Volt.
8.2 Option V252 – Internal Gas Flow Control
On demand the measuring gas unit can be equipped with gas flow
control.
The advantage of this optional equipment is in the complete
monitoring of gas flow. If the flow is restricted by external reasons or
if the built-in pump has a malfunction, the error message
“Pneumatic
system”
occurs.
The internal gas flow control circuit reacts under following
conditions:
-
Gas inlet tubing restricted or blocked
-
Gas outlet tubing restricted or blocked
-
Malfunction of the internal pump
-
Internal valves faulty
-
positive- or negative pressure over the Sensor too high (flow
resistance of tubing too high, hoses too long)
If malfunction of the internal pump is the reason for flow-alarm, pump
must be changed by the manufacturer or authorized service personnel.
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