NG # 02644-HW-KELLER-020
The Keller Series 23 Ed and 25 Ed are robust, analog industrial pressure transmitters certified for explosion-proof (Ex d) hazardous area applications. Unlike the digital "X" counterparts (e.g., Series 33 X Ed), these models utilize pure analog signal conditioning, delivering ultra-fast response times, high electromagnetic immunity, and low power consumption without microprocessor sampling latency.
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Get A QuoteThe Keller 23 Ed / 25 Ed Pressure Transmitters are analog piezoresistive pressure transmitters with pressure proof housing are approved for use in explosion risk areas of group II. They provide stable and accurate measurements of absolute and gauge pressures of liquid and gaseous media in the pressure range between 0,1 and 300 bar.
The modular structure of this product range allows highly flexible applications and solutions that are tailored to users‘ requirements. Numerous versions are available, for example with different pressure connections, materials and filling oils, or versions for use with oxygen and with special performance characteristics.
This series is based on the stable piezoresistive transducer with analog electronics. The zero point and sensitivity, and the temperature coefficients for the zero point and sensitivity, are compensated by resistors and/or potentiometers.
| Parameter | Specification Details |
| Pressure Ranges | $0.1\dots 1\text{ bar}$ up to $0\dots 1000\text{ bar}$ (Absolute or Gauge) |
| Hazardous Approvals | ATEX / IECEx: Ex db IIC T6 to T4 Gb (Flameproof Enclosure) |
| Accuracy / Linearity | $\pm 0.2\,\%\text{FS}$ typical ($\pm 0.5\,\%\text{FS}$ max including thermal zero drift) |
| Operating Temperature | $-40\text{ °C}$ to $+100\text{ °C}$ (Process media temperature dependent on Ex rating class) |
| Analog Signal Outputs | Standard 2-wire $4\dots 20\text{ mA}$ or 3-wire $0\dots 10\text{ V DC}$ |
| Power Supply | $8\dots 28\text{ V DC}$ (for 4–20 mA current loop) |
| Response Time | $< 1\text{ ms}$ (pure analog signal path, no digital sampling delay) |
| Housing / Wetted Parts | Stainless Steel 316L (1.4404 / 1.4435) with Hastelloy C-276 diaphragm options |
| Protection Rating | IP65 or IP68 (via integrated heavy-duty potted cable gland) |
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