Inquiry (采购产品): enquiry Dear Sir(s), I'm a fresh graduated engineer, working in the field of natural gas metering stations & their instrumentations. I'd be grateful if you can help,I need to know the models of electronic totalizers ,your company supplies, that nearly matches the below mentioned specifications If you can help,I'd like to know your product distributer in Egypt. Thank's in advance. Sincerely, Dalia El-Tarrass. Egyptian Town Gas Company (N.B.: those specifications are those of the already installed one that need to be replaced) POWER: Internal Battery: 3V, Lithium. Life expectancy: 5 years +. BACKLIGHT 10-30 VDC @ 30 mA max. (Derate operating temperature 1°C/Volt above 17VDC) Reverse polarity protected. PHYSICAL Operating Temperature: -20° to 70°C. Storage Temperature: -20° to 70°C. Operating Humidity: 60% Non-condensing. Weight: 2.2 oz. net. Display Size: .43" high. Front Panel Rating: NEMA 4X when mounted with gasket provided. Case Material: Cycolac X-17. TOTALIZER Type: UP counting. Digits: 8 COUNT ACCURACY 100% when operated within specifications. DC COMMON (Terminal ) COUNT INPUTS 1- Low speed input: designed for contact closures to DC common. Speed: 0 to 20 Hz. Min Low Time: 10 milliseconds. Min High Time: 40 milliseconds. Impedance: 101K ohm. Voltage Thresholds: Low 0 to 0.4 VDC. High 2.0 to 28 VDC. Max High 28 VDC. 2- High speed input : requiring a voltage source such as a current sourcing sensor or a current sinking sensor used with the provided pull up resistors. Speed: 0 to 10 kHz. Min Low Time: 80 microseconds. Min High Time: 20 microseconds. (The above times are with a 0 to 5.0 V swing.( Input Impedance: 2k? above 5 VDC. Voltage Thresholds: Low 0 to 1.2 VDC. High 2.0 to 28 VDC. Max High 28 VDC. 3- RESET INPUT : designed for contact closures to DC common. Min. Low: 0.25 to 1 sec. (reset is maintained). The required pulse width varies with count speed, scale factor and number of digits displayed. Voltage Thresholds: Low 0 to 0.4 VDC. High 2.0 to 28 VDC. 4- FRONT PANEL RESET ENABLE Operation: Level sensitive maintained. **** Hidden Message ***** dalia eltarrass 11345 EGY Company: E.T.G. E-mail: d_eltarrass@hotmail.com **** Hidden Message ***** d_eltarrass@hotmail.com
