TECHNICAL DESCRIPTION MULTICAL
®
401
5512-091 GB/02.2008/Rev. J1
56
13.1 Testing mode
Extra display readings
In addition to the display readings in standard mode there are two extra testing counters/verification registers for
energy and volume respectively. The testing counters appear as extra indications immediately after the main
counters for energy (E) and volume (Q). The resolution of the extra testing counters is for energy (E’) 10 [mWh] and
for volume (Q’) 1 [ml]. The main counters do not change unit or resolution in testing mode.
NB.: The resolution for the extra testing counters apply for all meter sizes from qp 0.6 to qp 15 m
3
/h.
Testing mode
The meter can be switched to testing mode by pressing the internal button marked ”P” for approx. 5 sec. or
serially through the test plug in the meter. When the meter is in testing mode a “P” appears farthest to the left in
the meter’s display. The internal push button is placed under the top cover. When the internal push button is
activated the meter changes to testing mode, whereas subsequent activation for 5 seconds brings the meter back
to standard operation.
In testing mode MULTICAL
401 runs through an integration sequence of 4 sec. Through this sequence the water
flow is measured with an average interval of 1 sec. Flow and return temperatures are measured in the middle of
the sequence, and at the end of the sequence the energy and volume calculations are made.
All display values are updated at an interval of 4 sec.
If both the internal push button and the front key are activated at the same time, an auto-integration sequence
starts in the meter (see section 13.2
Auto-integration).
To be able to operate the internal button and the test plug, modules or seals, if any, above the test plug must be
removed.
Resetting test counters Q’ and E’
The extra counters can be reset by pressing the internal button marked “P” or serially.
When resetting the testing counters, internal energy and water residue in the meter are also reset. This means
that accumulated energy and water may be missing in the main counters after repeated resets.
Standard mode
The meter can be put into normal mode again by pressing the internal button marked “P” for approx. 5 sec., or
serially through the test plug in the meter. If the meter is not put into standard mode it will automatically change
into standard mode after approx. 8 hours. When the meter has returned to standard mode the ”P” which earlier
appeared in the left side of the meter’s display will be turned off. Instead an ”E” may appear in the left side of the
display (see section 7.4
Information codes).
External control of testing counters Q’ and E’
It is possible to control the testing counters externally by means of a contact function. The contact must be
connected to pins 16 and 11 of the test plug. Only possible when pins 7-8 are short-circuited under the
verification seal. The function works as follows:
1. When connection is established, verification registers Q’ and E’ are reset, and the counting starts.
2. When the connection is released, the verification registers Q’ and E’ are locked.
3. Subsequently, the registers can be read from the display or serially.
4. A new test point can be carried out starting from point 1.
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