User's Guide

PE_QW1_V04_US
7
The interfaces are intended for data reading and meter parametrisation. The meter is configured for
being powered only from the internal battery, and the time of communication through the additional interfaces is
automatically limited to save the battery – up to 20 minutes per month. Unused communication limit is summed
up. If the limit is expired, the interface is blocked and the new time limit of communications will start only after
the change of the hour (16 seconds for each next hour).
Power supply
(one of following, dependently on meter configuration):
- one or two internal AA-size 3.6 V lithium (Li-SOCl
2
) batteries with a service life
of at least 16 years.
Mechanical data :
Dimensions of meter, not more than 2,95‘‘ x 3,03‘‘ x 7,48‘‘ (G1‘‘,L190),
Weight:
End connections (overall length) Weight of meter, not more than, kg
G3/4“ (3,1‘‘) 0,3
G3/4“ (4,1‘‘) 0,3
G3/4“ (4,3‘‘) 0,3
G3/4“ (6,5‘‘) 0,3
G3/4“ (6,7‘‘) 0,3
G1“ (4,1‘‘) 0,4
G1“ (4,3‘‘) 0,4
G1“ (5,1‘‘) 0,4
G1“ (6,5‘‘) 0,4
G1“ (7,5‘‘) 0,4
Operation conditions
Enclosure protection class: IP68
Operating conditions:
– ambient temperature 5
o
F to 158
o
F;
– relative humidity up to 100, condensing
– atmospheric pressure 86 kPa to 106.7 kPa
Installation: Indor or outdoor
Mechanical environment class: M1
Electromagnetic environment class: E2.
3 OPERATING PRINCIPLE
The flow measuring principle is based on ultrasonic measurement method. The ultrasonic signal along
the measuring section moves many times before, and the flow downstream between the ultrasonic sensors
have to perform transmitter and receiver functions. From the resulting time difference the flow rate is calculated
and indicated in display
Water meter performs all necessary measurement and data storage functions. Below are the most important:
- High stability in measuring water volume and detection characteristics of overload;
- Calculation of the maximum values and their storage in archive;
- Storage of data necessary for reports on set day yearly and monthly;
- Archive data storage time 36 months
- Detection of fault
- Displaying of values of parameters (optional) and displaying of info codes
- Verification and service functions.
4 MARKING AND SEALING
Marking
There are following information on the front panel of the calculator of the meter - required certificate
number, manufacturer’s trade mark, type of meter, year of manufacture and serial number, permanent flow rate