NG # 02637-HW-KELLER-013
The Keller Series 33 X Ed and 35 X Ed are high-precision, digital pressure transmitters approved for flameproof/explosion-proof (Ex d) environments. They are designed for hazardous area industrial installations where explosive gases or dust are present, combining high-resolution piezoresistive sensing with digital signal processing and dynamic mathematical compensation.
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Get A QuoteThe Keller 33 X Ed / 35 X Ed Pressure Transmitter are piezoresistive pressure transmitters with pressure proof housing and 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 features microcontroller-based electronic evaluation to ensure maximum accuracy. Each transmitter is gauged across the entire pressure and temperature range. This provides the basis for calculating a mathematical model that corrects all reproducible errors. The pressure value can be read via the interface and at the same time it is also available in analog form as a 4-20 mA or 0 to 10 V version.
| Parameter | Specification Details |
| Pressure Ranges | $0.8\dots 3\text{ bar}$ up to $0\dots 1000\text{ bar}$ (Absolute or Sealed Gauge) |
| Hazardous Area Rating | ATEX / IECEx: Ex db IIC T6 to T4 Gb / Ex tb IIIC T80°C to T130°C Db |
| Total Error Band | $\pm 0.05\,\%\text{FS}$ (between $10\text{ °C}$ and $40\text{ °C}$); $\pm 0.1\,\%\text{FS}$ (between $-10\text{ °C}$ and $80\text{ °C}$) |
| Signal Outputs | Dual Output: Digital RS485 (Modbus RTU / Keller Protocol) + Analog 4–20 mA (2-wire) or 0–10 V DC (3-wire) |
| Power Supply | $8\dots 28\text{ V DC}$ (for 4–20 mA output); $13\dots 28\text{ V DC}$ (for 0–10 V DC output) |
| Operating Temperature | $-40\text{ °C}$ to $+100\text{ °C}$ (Process media temperature dependent on Ex rating) |
| Sampling Rate | 400 Hz (dynamic digital measurements) |
| Housing Material | Stainless Steel 316L (1.4404 / 1.4435) |
| Protection Degree | IP65 or IP68 (depending on cable gland connection) |
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