counter (LCD-Display), resettable
$289.68
Manufacturer: Ritter
Product Code:ZW-LCD
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Description
counter (LCD-Display), resettable
Description of counter (LCD-Display), resettable
Suitable for: RITTER Drum type gas mater and RITTER Bellow type gas mater
Indication: TG05: 0 to 9.999.999,5 ltr;
all other meters: 0 to 99.999.999 ltr
Resolution: = volume of measuring drum
Application
The resettable LCD counter displays the volume measured by the gas meter. As an option it is available for RITTER drum-type and bellows-type gas meters and must be ordered along with the gas meter.
Use in ex-proof areas
The LCD counter is not intrinsically safe. Therefore, it cannot be used in ex-proof areas in general! For exceptions please check with your authorized ex-proof safety representative
Functional principle
At rear side of the needle at the dial face of the gas meter there is mounted a permanent magnet. Furthermore, there is also mounted a reed contact behind the dial face in a twelve o’clock position of the dial face. The permanent magnet closes the reed contact once per revolution of the measuring drum of the gas meter. Each pulse of the reed contact adds a volume increment to the displayed volume. The volume increment equals the measuring drum volume of the respective gas meter or the volume of a full needle rotation, respectively. Fractions of a drum revolution are indicated by the dial face indicator (needle).
The LCD display is battery operated.
Please note:
- If the direction of drum rotation is reversed (by under-pressure at the gas inlet or over-pressure at the gas outlet), the pulses of the reed contact are detected by the counter. Subsequently, the respective »negative« gas volume is wrongly added because a detection of the rotational direction of the drum is not possible with the red contact.
- Prior to resetting the counter to »zero«, the needle must be set to »twelve o’clock position«. This may be done by turning the needle. Because the indication needle is coupled to the drum via the shaft and magnetic coupling, the gas meter must be depressurised (gas inlet/outlet open) so that the drum can rotate without resistance and the indicator needle can be reset to »zero« easily. The indicator needle may also be reset by a pulling off and later putting on of the indicator needle. Please pay attention that the indicator needle is put to limit stop (fixing collar) as otherwise the space between magnet and reed contact might be too big and thus, no pulses can be counted. A distortion of the indicator needle may lead to an identical solution.
Tecnical data
| Battery life time | approximal 5 years | |
| Reset | manual reset via pushbutton (can be locked) | |
| Reset lock | via bridge between terminals »Keylock« and »0 V« | |
| Operating temperature | -10 to +50°C | |
| Display | 8-digit LCD, 7 mm | |
| Supply voltage | internal lithium battery | |
| Protection class (IEC 144) | Front side IP 65, terminals IP 20 | |
| Electrical connection | screw terminals | |
| Input resistance | < 50 kΩ (static) |
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