Multi-point RTD on one card
The card is for multi-point platinum RTD measurement and a process record you can audit. The figures on this page are what a bid schedule and a later spot check both use. Three-wire or four-wire wiring cancels lead resistance. Channel isolation and a wide-temperature front end are available, so a substation bus duct, heat-traced chemical pipe, or a cold-store zone can be read again and calibrated again. The front end uses constant-current excitation, several filter settings, and open-circuit detection. Terminals pull out, the watchdog and the redundant check are in place, and firmware can be signature-checked and rolled back for a batch shipment and remote service.
The default port is a fiber SFP on a standard industrial connector, for SCADA, energy management, or an IoT platform. SimtoLink includes a southbound point-table template and northbound MQTT/HTTP examples so the joint test is shorter. Volume jobs can add case marking, a set harness length, a protocol map, and a calibration certificate.
How the card holds a reading
CE and FCC test items are on the record. Each port has surge and reverse-polarity protection. Ground is zoned so a loop or common-mode noise is less likely to shift a channel. Outdoor and coastal orders can take a higher ingress rating and a corrosion coating.
A batch file can load parameters and thresholds. Selected models store an event or a waveform. Configuration and firmware go out by OTA. Accept the card with a power-on self-test, a time sync, and a sample of channels. For metering or safety, SimtoLink helps file it with a third-party metrology lab and hands over the type-test pack.
Hardware figures
Typical figures for the standard order, for selection and for a technical clause. For a wider range, a redundant supply, or an intrinsically safe explosion-proof variant, ask SimtoLink for the hardware specification and the installation guide. Order codes in the family can differ slightly; the nameplate and the pack list govern.
| Item | Specification | Note |
|---|---|---|
| Channels | 64 DI | Differential or single-ended |
| Resolution | 24 bit | No missing codes |
| Sample rate | Up to 200 kS/s | Simultaneous sampling |
| Input range | ±5V | Programmable gain |
| Accuracy | ±0.051 %FS | Calibrated at constant temperature |
| Isolation | Isolation between channels | Withstand 1kV |
| Clock | NTP | Sync error <1 μs |
| Communication | Remote RS485 | SCPI/Modbus |
| Trigger | External TTL | Pre-trigger depth |
| Power | <18 W | Typical at full load |
Where the card is used
Four placements that show up when the temperature field has to pay for itself.
Petrochemical and power piping
Points on a reactor jacket, a long pipe gallery, and a valve island drive trace-heating power and a leak warning, and they feed the process safety interlock.
Cold chain and food processing
The temperature field in a layered cold store, on a blast-freeze line, and in a lab incubator is kept so a HACCP check and a batch record can be pulled later.
Data halls and switchrooms
Hot spots between in-row cooling, busbars, and UPS units become a continuous temperature-rise curve for PUE work and capacity planning.
Rail cars and equipment bays
Temperature rise on a traction converter, in a battery bay, and inside an electrical cabinet is sent up so maintenance can be planned and summer load can be set.
Install, ground, and recheck
- Check the supply window and polarity before the card is powered. Measure bus voltage and the breaker rating if the feed is uncertain.
- Run the link as shielded twisted pair, ground the shield once, and keep it off long power-cable bundles.
- Read, write, and trip a threshold against the platform in the lab before the card leaves for site.
- Outdoors, give water a way out and air a way through, inspect the gasket, and keep the lightning earth inside the local code.
- Once every 12 months, sample channels and file the log.
Order, documents, and support
SimtoLink supplies the hardware specification, outline drawing, wiring table, and a sample project. Volume orders can include a sample review and a factory inspection. Warranty and calibration follow the contract and the papers in the box.