NG # 02645-HW-KELLER-021
The Keller Series 35X HTC is a high-temperature, capacitive pressure transmitter engineered specifically for extreme process temperatures up to 300 °C (or Dynamic 350 °C peak).
Unlike standard transmitters that house electronics close to the pressure fitting, the 35X HTC features a distinct cooling extension/standoff rod assembly that thermally decouples the front-flush sensing cell from the signal-processing microprocessor, ensuring high precision in extreme thermal environments.
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Get A QuoteThe Keller 35X HTC Pressure Transmitter is a piezoresistive high temperature transmitter that is suited for media temperatures up to 300°C. The pressure, acting onto the flush diaphragm, is transferred over an oil-filled capillary onto the silicon measuring cell. The capillary has the function of a cooling spiral, allowing media temperatures of up to 300°C. The temperature of the electronics, which can be read out with the PROG30 software, may not exceed 120°C. For highly aggressive media, KELLER offers pressure ports in different materials.
This Series is based on the stable, piezoresisitive transducer and a micro-processor electronics with integrated 16 bit A/D converter. Temperature dependencies and non-linearities of the sensor are mathematically compensated. With the READ30 software and the KELLER cable K-107, the calculated pressure can be displayed on a Palmtop, Laptop or PC. The READ30 software also allows the recording of pressure signals and the graphic display on the PC. Up to 128 transmitters can be hooked together to a Bus-system.
The micro-processor integrates a D/A converter of 16 bit for analog signal outputs of 4-20mA or 0 to 10 V. The output rate is 100 Hz (adjustable). The digital output is available on all transmitters with analog output. With the KELLER software READ30 and PROG 30, a RS485 converter (i.e. K-102, K-104 or K-107 from KELLER) and a PC, the pressure can be displayed, the units changed, a new gain or zero set. The analog output can be set to any range within the compensated range.
| Parameter | Specification Details |
| Pressure Ranges | $0\dots 3\text{ bar}$ up to $0\dots 300\text{ bar}$ (Absolute or Gauge) |
| Media Temperature Range | $-20\text{ °C}$ to $+300\text{ °C}$ continuous ($+350\text{ °C}$ peak/short duration) |
| Electronics Temperature | $-20\text{ °C}$ to $+80\text{ °C}$ |
| Accuracy / Total Error Band | $\pm 0.15\,\%\text{FS}$ (compensated range $20\text{ °C}$ to $120\text{ °C}$); $\pm 0.5\,\%\text{FS}$ max ($20\text{ °C}$ to $300\text{ °C}$) |
| Sensor Technology | Piezoresistive / Capacitive front-flush metal diaphragm with oil fill |
| Signal Outputs | Dual Output: Digital RS485 (Modbus RTU / Keller Protocol) + Analog 4–20 mA (2-wire) or 0–10 V DC |
| 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) |
| Process Connections | G 1/2" male front-flush thread, Tri-Clamp, or Ingold hygienic flange |
| Wetted Materials | Stainless Steel 316L (1.4435) or Hastelloy C-276 |
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