PT100 Armored Temperature Probe

Low driftComponent class

12～24VIsolated supply (PoE optional)

RS485Uplink

IP54Enclosure (IP67 optional)

A contact probe for weather and process

Built for weather-sensing IoT. The element is a platinum RTD: PT100 in this series, PT1000 if ordered that way. It is not interchangeable with a thermocouple. The signal is not millivolts, and the standard is different. The armored core can go into a thermowell or be held against a housing with a thermal compound. The transmitter stays predictable across wide temperature, wide supply voltage, and electrical noise, and the reading is traceable to IEC 60751 and to an on-site comparison. Three-wire or four-wire must match the ordered model, or lead resistance shows up in the reading. Terminals pull out, key chips have a watchdog and a redundant check, and firmware can be signature-checked and rolled back, which is what a batch shipment and remote service need.

The default interface is isolated RS485 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 commissioning is shorter. Volume jobs can add case marking, a set harness length, a protocol map, and a calibration certificate.

How the reading stays put

CCC test items are on the record. Ports have surge and reverse-polarity protection. Ground is zoned so a loop or common-mode noise is less likely to move the reading. Outdoor and coastal orders can take a higher ingress rating and a corrosion coating.

Parameters can be loaded as a batch, thresholds can raise an alarm, and selected models store the event. Settings and firmware travel by OTA. Accept the probe with a power-on self-test, a time sync, and a sample of readings. For metering or safety, SimtoLink helps with a third-party metrology submission and the type-test file.

Hardware figures

Figures below are the typical build, for selection and for a bid schedule. 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 this family can differ slightly; the nameplate and the papers in the box decide.

Item	Specification	Note
Sensing element	PT100 (PT1000 to order)	Platinum RTD, IEC 60751
Temperature span	-42～155 ℃	Can be customized
Accuracy	±0.34 ℃	@-20～80℃
Supply	DC 12～24V	Isolated; PoE powered-device is an order option
Interface	4～20mA + RS485	Can be redundant
Ingress rating	IP54	Outdoor model can be IP67
Power draw	<0.97 W	Typical
Response time	<18 s	τ63
Long-term drift	<0.14 ℃/year	Laboratory conditions

Three ways it is usually placed

These are the three placements that come up when the return on a temperature point is being judged.

Manufacturing and energy sites

On a line or in a switchroom, the probe feeds MES or EMS with the process temperature, or with the temperature that sits behind an energy figure.

Municipal utilities

Scattered points and outdoor cabinets use the wide-temperature and lightning design, which fits water, gas, and street-lighting runs that are long and need a short delay.

Campuses and buildings

The probe joins a campus energy system or a building automation system for sub-metering, an abnormal-temperature alarm, and a linked action, so fewer rounds are walked to read a gauge.

Install, ground, and check

Confirm the supply window and polarity before the probe is powered. If the cabinet feed is in doubt, measure bus voltage and the breaker rating.
Use shielded twisted pair, ground the shield at one end, and do not lash it to a power cable for a long run.
In the lab, read and write against the platform and trip one threshold, then take the probe to site.
Outdoors, let water leave and air move, look at the seal on a round, and keep lightning-earth resistance inside the local rule.
Every 12 months, sample a set of points and archive the log.

Order, documents, and support

SimtoLink supplies the hardware specification, the outline drawing, a wiring table, and a sample project. Volume orders can include a sample review and an inspection at the factory. Warranty and calibration follow the contract and the papers shipped with the probe.

Where the probe actually sits

An armored PT100 or PT1000 is meant to stay buried or in contact for a long time, and to be a temperature point that weather, plant, and municipal systems can trust. The four cases below differ in how the probe is mounted and what the reading is used for, so an RTU, a PLC, or a cloud platform can take it directly.

Regional stations and a soil-temperature profile

The probe sits in a Stevenson screen or a radiation shield that follows the WMO note, and is sampled with a shallow soil-temperature string, grass temperature, and soil volumetric water content. Minute data, tagged by the station quality rules, goes to the provincial backbone or a regional assessment platform for frost and icing warnings, farm guidance, and a climate series that stays comparable with the historical record.

Reactor jackets in chemical and pharmaceutical plants

The armored probe reaches into the jacket, the circulation loop, or the space between glass-lined layers. It follows the DCS batch curve and the recipe step so a local overshoot or a coking risk can be held down. Isolated analog outputs and a redundant channel go to a safety PLC, an SIS zone, and a sequence-of-events record, which is what an audit trail and a batch-release file need for the original temperature.

Cold stores and cold-hold points

Points are placed in refrigerated trucks, on cold-store rack airways, and at return-air openings so the vertical and depth gradients are mapped, and tied to door contacts, defrost, and thaw. The raw record exports with a timestamp and a serial number, which is the evidence chain GSP, HACCP, and pharmaceutical logistics expect in a spot check or an unannounced inspection.

Utility tunnels

Probes run along the roof of the power cabin and the heat cabin, and along cable-tray layers, watching joint overheating, an abnormal rise, and a temperature difference that can precede a fire. An edge gateway filters thresholds and buffers through a break, then hands the point to the tunnel work-order system, emergency command, and the fire IoT platform so inspection routes and alarm close-out can be scored.