QALCOMET HEAT 1, Руководство пользователя

Страница: 19 / 52

Heat meter calculator QALCOMET HEAT 1 PEQMH1V01
19
7.1.3. Flow, temperature and pressure sensors have to be installed according to installation
requirements given in the corresponding installation manuals and by requirements as provided in Annex
B, Table B1.
Electrical installation of calculator, flow, temperature and pressure sensors is performed according to
selected measurement scheme (Table 1) and appropriate installation diagrams (Appendix B), also
according to technical requirements for other system components. Description of connection terminal pins
is provided in Appendix C.
Cross-section for each signal cable should be not less than 0,14 mm
2
. If cable length between
calculation unit and sensors exceeds 5 m, shielded cables have to be used. Cables should be run through
rubber seal caps and anchored with clamps. Four-, three- or two-wire cable should be used respectively.
Cable shield should be connected to appropriate terminal pins (see diagram in Appendix B) or to any free
contacts marked with symbol “ “, either anchored with metal clamps.
Calculation unit may be connected to mains power supply only through switch (nominal current 0,1
A), placed close to the device, using two-wire cable with cross-section of each wire not less than 0,5
mm
2
.
To ground the equipment, copper wire with cross-section not less than 0,5 mm
2
should be used.
Shielded cable should be used for all connections longer than 1,5 m. The shield should be properly
grounded. It is recommended to use plastic or metal sleeves for additional cable protection.
7.2. Setting up the configuration
The calculating unit is universal device for measurement of supplied (consumed) heating energy.
The calculating unit has to be customized for the particular application, putting into account the type of
heating system, also types of flow, temperature and pressure sensors. After placing an order, calculating
unit is adapted to one of eight possible measurement schemes. Energy calculation formulas and
measurement schemes are presented in the Table 1. Flow, temperature and pressure channels, not utilized
for heat energy measurement, can be used to control other parameters. It is possible to select
measurement units for flow measurement (volume units or mass units
–
according to measured media
temperature).
The calculator has to be programmed for the specific application using the control buttons

and

, also the configuration button “SET” (under the lid, see Fi
g. 8.1 and 8.2).
To enter the configuration mode, open the lid and press the button “SET”. Press the “SET” button
once more to leave the programming mode.
When configuration (programming) mode is active, label “SET” is displayed in the upper right
conner of the display. All parameters have to be programmed. Possible parameter limits and abbreviations
are listed in Appendix A.
The algorithm for setting up parameters is shown in Fig. 7.1.
REMARK: 1.
All parameters marked with the symbols “*”, “**” have to be
programmed
correspondingly in the same way.
2.
Readings on the indicator ( for example: “1.00E
-
2”) are presented in exponential
form.
There: X.XX E XX
For example: indicated value 1,25E-2 = 1,25*10
-2
= 0,00125.
Exponent value
Base value