Key Features Of The Titan TPT-SDI SDI-12 Pressure Transmitter
Native SDI-12 Version 1.4 Interface
Connects directly to SDI-12 data loggers and RTUs, with several sensors able to share one bus.Ultra-Low Power Consumption
Less than 250 µA when idle and under 4 mA when active, ideal for battery and solar-powered sites.Wide 6 To 36 VDC Supply
Runs from common 12 V and 24 V battery, solar and telemetry power systems.Ceramic Sensing Cell
A 96% alumina (Al2O3) diaphragm resists corrosion for long-term stability in water and harsh media.16-Bit Digital Compensation
An onboard microprocessor handles linearization, temperature compensation and calibration, with thermal error of just ±0.01% FS/°C.Built-In Lightning Protection
An integral gas discharge tube helps protect the sensor on exposed outdoor installations.
Applications For SDI-12 Pressure Transmitters
The Titan TPT-SDI is built for unattended, low-power pressure monitoring wherever SDI-12 loggers are used:
- Environmental and hydrological monitoring – pressure measurement on SDI-12 logging networks.
- Water distribution networks – remote pressure logging on mains, pumping stations and district metering.
- Fire hydrant pressure monitoring – long-term logging of supply pressure at hydrants.
- Remote terminal units (RTUs) – a low-power digital input for telemetry outstations.
- Solar and battery-powered stations – minimal current draw extends battery life between visits.
- Data loggers – direct digital connection with no analog input channel required.
- OEM systems – an addressable digital sensor for monitoring equipment and skids.
- Laboratory and research projects – field studies and long-duration test programs.
What Is SDI-12 And Why Use It For Pressure Measurement?
SDI-12 (Serial Digital Interface at 1200 baud) is a communications standard developed for environmental monitoring. It lets a data logger power, address and read intelligent sensors over a simple three-wire connection: power, ground and a single data line. Each sensor has its own address, so multiple sensors can share the same cable run back to the logger.
For remote sites this brings clear advantages over 4-20 mA or voltage outputs. Sensors sleep between measurements, so average power consumption is very low. Readings arrive as calibrated digital values, so there are no analog scaling errors or input cards to configure. And because the bus is shared, wiring is simpler and cheaper on sites with several sensors. The TPT-SDI brings these benefits to a rugged, ceramic-sensor pressure transmitter.
Power, Protection And Connections
- Supply voltage – 6 to 36 VDC
- Current consumption – under 250 µA idle, under 4 mA active
- Lightning protection – integral gas discharge tube
- Reverse polarity – no damage, but no function
- Electrical connections – M12 x 1 4-pin, mini DIN 43650 or cable outlet, IP65 for M12 gauge ranges up to 50 bar and IP67 otherwise
- Process ports – G1/4 DIN 3852 male, 1/4 NPT male or Series 21 quick release
Titan TPT-SDI Pressure Transmitter Technical Specifications
| Specification | Detail |
|---|---|
| Product Type | Digital pressure transmitter with SDI-12 output |
| Sensor Technology | Ceramic (96% Al2O3) piezo-resistive |
| Digital Interface | SDI-12 version 1.4 |
| Signal Processing | 16-bit microprocessor (linearization, temperature compensation, calibration) |
| Supply Voltage | 6 to 36 VDC |
| Current Consumption | < 250 µA idle, < 4 mA active |
| Pressure Reference | Gauge (standard), sealed gauge, absolute |
| Pressure Ranges | 0.5, 1, 2, 5, 10, 20, 50, 100, 200, 400 bar |
| Safe Overpressure | 1.5 x rated range |
| Burst Pressure | 3 x rated range |
| Accuracy | ≤ ±0.25% FS standard, ≤ ±0.10% FS optional |
| Long Term Stability | ≤ ±0.10% FS |
| Thermal Effects | ±0.01% FS/°C |
| Media Temperature | -40 to +125 °C |
| Ambient Temperature | -20 to +85 °C |
| Storage Temperature | -20 to +85 °C |
| Wetted Materials | 303 stainless steel, Al2O3 ceramic, Viton (FKM) seal; 316 stainless steel, EPDM and NBR optional |
| Permissible Media | Liquids and gases compatible with the wetted materials |
| Process Connections | G1/4 DIN 3852 male, 1/4 NPT male, Series 21 quick release |
| Electrical Connections | M12 x 1 4-pin, mini DIN 43650, cable outlet |
| Ingress Protection | IP65 or IP67 depending on connection and range |
| Lightning Protection | Integral gas discharge tube |
| Reverse Polarity | No damage, no function |
| Conformity | CE |
| Accessories | Straight and right-angle M12 cordsets, USB to SDI-12 interface |
Titan TPT-SDI SDI-12 Pressure Transmitter FAQs
What is an SDI-12 pressure transmitter?
It is a pressure transmitter that sends calibrated readings as digital data using the SDI-12 protocol, rather than as a 4-20 mA or voltage signal. It connects to any data logger or RTU with an SDI-12 port.
Can several TPT-SDI sensors share one cable?
Yes. SDI-12 is an addressable bus, so multiple sensors, each with its own address, can be connected to the same data line and read individually by the logger.
How much power does the TPT-SDI use?
It draws less than 250 µA when idle and less than 4 mA when taking a measurement, from a 6 to 36 VDC supply, which makes it well suited to battery and solar-powered sites.
What pressure ranges are available?
Standard ranges are 0.5, 1, 2, 5, 10, 20, 50, 100, 200 and 400 bar in gauge, sealed gauge or absolute reference.