PRESSURE TRANSMITTERS
Pressure Transmitters — Loop-Powered 4–20 mA with HART & RS485
A pressure transmitter conditions the raw sensor signal into a loop-powered 4–20 mA output — the signal plants have trusted for decades — and adds digital communication for remote configuration and diagnostics. Up to ±0.1% FS accuracy, 0–60 MPa, with explosion-proof options.
TRANSMITTER VS TRANSDUCER
Same Sensing Core, Much Longer Reach
Both start with the same welded 316L diaphragm and piezoresistive cell. The transmitter adds the electronics that make the signal survive distance, noise and integration: loop power, 4–20 mA conditioning and digital communication.
| Feature | Pressure Transducer | Pressure Transmitter |
|---|---|---|
| Output | Raw or amplified signal — 0–5 V, 0–10 V, or simple 4–20 mA | Conditioned 4–20 mA loop with digital HART / RS485 Modbus |
| Power | Usually 3-wire with separate supply | Loop-powered 2-wire, 12–36 V DC on the signal pair |
| Accuracy | ±0.5% FS typical | ±0.1% FS available (PT200 series) |
| Communication | None — local reading only | HART or RS485 for remote configuration and diagnostics |
| Best for | OEM machines, local control, short runs | Plant-wide monitoring, SCADA / DCS, hazardous areas |
Not sure which you need? Read pressure transducer vs transmitter — or send us your system layout and we will recommend one.
OUTPUT OPTIONS
Three Ways to Get the Value to Your System
4–20 mA Two-Wire
The industrial standard. Loop-powered over two wires, immune to cable voltage drop and electrical noise. Every PLC and DCS on the market reads it.
Best for: Long cable runs, noisy plants, standard analog cards
4–20 mA + HART
Digital FSK communication superimposed on the same two wires. Change range, re-zero, read diagnostics and configure the transmitter remotely without touching it.
Best for: Smart field instruments, remote calibration, asset management
RS485 Modbus
Pure digital bus output — up to 32 devices per segment with live pressure and status registers. Ideal for SCADA, energy monitoring and multi-point test stands.
Best for: SCADA integration, multi-drop bussing, data logging
All output options are factory-configurable on the PT200 series — specify your receiver (PLC card, SCADA gateway or instrument bus) and we will match it.
Technical Specifications — PT200 High-Accuracy Transmitter
| Item | Specification |
|---|---|
| Accuracy | ±0.1% FS |
| Pressure Range | Up to 0–60 MPa (custom spans) |
| Output Signal | 4–20 mA two-wire, + HART or RS485 Modbus |
| Diaphragm | 316L SS standard, Hastelloy optional |
| Housing | IP67, explosion-proof (Ex) optional |
| Power Supply | 12–36 V DC (loop powered) |
| Certification | CE, Ex optional |
* Typical values — final span, output and housing are configured per order. Contact us for the current datasheet.
Applications
Transmitters earn their place wherever the reading has to travel — across a plant, into a control room, or into a SCADA historian.
FAQ
Questions Buyers Ask
What is the difference between a pressure transmitter and a pressure transducer?
A transducer produces a signal proportional to pressure — typically voltage or a simple 4–20 mA. A transmitter is a transducer plus a loop-powered conditioner that outputs 4–20 mA with digital communication (HART or RS485), so readings survive long cable runs and integrate with plant systems. Our pressure transducer vs transmitter guide explains it in detail.
Which output is best for remote monitoring?
For a single sensor on a long loop, 4–20 mA two-wire is the proven choice. When you need range changes, diagnostics or multi-device bussing, step up to HART or RS485 Modbus — both are supported on the PT200 series.
What does HART give me over plain 4–20 mA?
HART superimposes a digital signal on the analog loop, so you keep the 4–20 mA for your PLC while gaining remote range change, re-zeroing, diagnostics and multi-drop capability over the same two wires.
What is the difference between 2-wire and 3-wire?
A 2-wire transmitter is loop-powered: power and signal share the same pair, which simplifies cabling and suits long runs. A 3-wire (voltage output) unit has a separate power supply and is best for short, machine-internal runs.
Can I get an explosion-proof transmitter?
Yes — the PT200 series offers an optional explosion-proof housing (Ex) with IP67 protection, suited to hazardous-area installations. Specify your zone and certification requirement when requesting a quote.
Can transmitters be calibrated to my exact range?
Yes. Spans are factory-configured to your working point, and HART / RS485 transmitters also allow remote range reconfiguration in the field without opening the housing.
Need a Transmitter That Talks to Your System?
Tell us your range, output (4–20 mA, HART or RS485), media and environment — we will quote the right PT200 configuration within 24 hours.