- Long battery life through intelligent measurement control
- Easy integration thanks to several radio-standard options
- Numerous application possibilities – also as retrofit
- Robustly built, permanently reliable temperature measurement
 Datasheet |
| User Manual |
- IIoT-capable measuring instrument in combination with WIKA radio unit, model NETRIS®3
- Mechanical on-site indication with integrated digital interface
- Intrinsically safe version Ex i per ATEX, IECEx
- Compact design
- Scale ranges from -200 ... +700 °C [0 ... 500 °F]
| Datasheet |
| User Manual |
- IIoT-capable measuring instrument in combination with WIKA radio unit, model NETRIS®3
- Sensor range from -196 ... +500 °C [-321 ... +932 °F]
- For direct installation into the process or common thermowell designs
- Intrinsically safe version Ex i
- Very compact design
| Datasheet |
| User Manual |
- Long battery life through intelligent measurement control
- Easy integration thanks to several radio-standard options
- Numerous application possibilities – also as retrofit
- Robustly built, permanently reliable temperature measurement
| Datasheet |
| User Manual |
- IIoT-capable with LPWAN transmission
- High transmission range for the measured values (up to 10 km [6.2 mi]) with long battery life (up to 10 years)
- Battery-operated or external power supply for radio transmission possible
- Easy integration thanks to several radio standards
| Datasheet |
| User Manual |
- IIoT-capable with LoRaWAN® transmission
- Battery-operated LoRaWAN® wireless transmission based on LPWAN technology
- High transmission range for the measured values (up to 10 km [6 mi]) with long battery life (up to 10 years)
- Two intrinsically safe analogue input signals with 4 ... 20 mA
- The determination of differential pressures is possible
| Datasheet |
| User Manual |
- IIoT-capable with LoRaWAN® transmission
- Battery-operated LoRa® radio transmission based on LPWAN technology
- High transmission range for the measured values (up to 10 km) with long battery life (up to 10 years)
- Exchange of the radio unit possible in ATEX zones
| Datasheet |
| User Manual |
- High-accuracy sensor technology
- Modbus® output protocol via RS-485 interface
- Ingress protection IP65
- Very good long-term stability and EMC characteristics
- Compact dimensions
 Datasheet
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User Manual
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- High-accuracy sensor technology
- Modbus® output protocol via RS-485 interface
- Ingress protection IP65
- Very good long-term stability and EMC characteristics
- Compact dimensions
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Datasheet
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User Manual
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IIoT Temperature Monitoring – from Sensor to Dashboard
IIoT temperature monitoring connects RTD/thermocouple sensing and head transmitters (e.g., SITRANS TH) via RS-485/Modbus RTU, HART (4–20 mA), IO-Link, or Ethernet to edge gateways and cloud/SCADA. The edge collects, scales, and timestamps measurements, transmits them securely via MQTT/HTTPS, and enables real-time dashboards, alarms, reporting, and traceability — vendor-agnostic integration with WIKA, Siemens SITRANS, and others. With TLS/VPN, role models, and audit logs, you meet security and compliance requirements. This turns temperature probes into transparent, maintenance-friendly IIoT assets that reduce downtime and make quality measurable.
FAQ on IIoT Temperature Monitoring
Answers to the most common questions on sensors, head transmitters, protocols, sampling rates, data quality, security, and practical integration.
Are all RS-485/Modbus devices automatically IoT-ready?
No. RS-485 is the field layer. IoT emerges only with an edge/gateway (Modbus→MQTT/HTTPS), stable device IDs, secure transport (TLS/VPN), and alarm/telemetry logic.
Which temperature hardware is particularly suitable for IIoT?
RTD/TC probes combined with head transmitters (e.g., SITRANS TH series), room/duct sensors with RS-485/Modbus, and IO-Link temperature transmitters for fast parameterization.
How do RTDs (Pt100) differ from thermocouples in an IoT context?
| Criterion | RTD (Pt100/Pt1000) | Thermocouple (e.g., Type K) |
|---|---|---|
| Accuracy | Very good | Good to medium |
| Measuring range | −200…+600 °C (typ.) | −200…+1350 °C (typ.) |
| Stability/drift | Low | Higher at high T |
| Lead influence | 2/3/4-wire compensation | Cold-junction compensation required |
| IoT integration | Very convenient via head transmitter | Via head transmitter or special modules |
Which head transmitters are especially suitable for IIoT?
Models with HART/PA/FF or RS-485/Modbus, configurable (e.g., dual sensor, sensor backup, linearization), with diagnostic flags and stable identities for clean topic design.
How often should I acquire/publish temperature values?
Guidelines — depending on process dynamics and energy/message budget:
| Application | Interval | Note |
|---|---|---|
| Room/HVAC monitoring | 5–30 s | On-change (±0.2 K) useful |
| Process temperature (moderate) | 2–10 s | Alarms with hysteresis |
| Fast processes | 0.5–2 s | Consider thermowell/response time |
| Energy/trends | 10–60 s | Downsampling in historian |
How should I design MQTT topics for temperature data?
Example: plant/{site}/area/{line}/temp/{id}/value, …/status, …/alarm. Publish metadata (unit, scaling, sensor type, calibration date) as retained properties.
How do I secure communication and access?
TLS (MQTTS/HTTPS), per-gateway certificates, roles/scopes, API keys, VPN/zero-trust, signed firmware, patch/certificate management, and audit logs.
Which placement tips improve measurement quality?
Good airflow/exposure, thermowell matched to medium dynamics, thermal decoupling from housing, avoid self-heating (electronics/heaters), sufficient immersion depth.
2-, 3-, or 4-wire technique for Pt100?
| Wiring | Advantage | Disadvantage | Recommendation |
|---|---|---|---|
| 2-wire | Simple, inexpensive | Lead resistance skews reading | Only short runs |
| 3-wire | Accuracy/cost compromise | Requires symmetry | Industry standard |
| 4-wire | Best accuracy | More complex | Calibration/quality applications |
How do I handle calibration and traceability?
Store calibration certificate ID, date, method, and reference as device properties; version changes (offset/span); provide an exportable history (CSV/JSON) for audits.
How should alarms be defined?
Hi/Lo thresholds with hysteresis, rate-of-change (dT/dt), sensor faults (open/short), plausibility checks (redundant probe comparison) — trigger alarms locally at the edge, cloud-independent.
Can I operate without a cloud?
Yes. On-prem MQTT broker + SCADA/Grafana are common. Cloud pays off with multiple sites, fleet management, AI analytics, and centralized access.
Which enclosures/IP ratings are recommended?
At least IP65 in harsh environments; in wash-down/IP69K and hygienic design (EHEDG), prefer smooth surfaces, O-ring concepts, and media-resistant materials.
What must I consider in hazardous areas?
ATEX/IECEx approvals, protection type (e.g., Ex ia), intrinsically safe barriers/isolators, suitable enclosures; place gateways in safe zones where possible.
How does the thermowell affect measurement?
It protects the probe but can slow response. Consider wall thickness, insertion length, flow velocity, and resonance (VIV); choose materials suitable for the medium.
How do I minimize EMC effects on RS-485?
Use shielded twisted pair, correct termination (120 Ω), biasing, short stubs, clean bonding/grounding, and separate power from signal cabling.
Which data belong in the historian/reports?
Raw values (optionally down-sampled), min/max/avg, alarm events/acks, status/diagnostics, maintenance/calibration; ensure unit consistency (e.g., °C) and a UTC time base.
What costs typically arise?
Guidelines — depending on device count and scope:
| Scope | Deliverables | Effort (estimate) |
|---|---|---|
| ≤ 10 measuring points | Edge, wiring, basic dashboard | 1–3 person-days |
| 10–50 | Segments, alarms, roles | 3–10 person-days |
| 50+ | Fleet management, templates, reporting | PoC → phased roll-out |
How do I start a pilot project?
Workshop (goals/KPIs, device list) → set up edge + 3–5 measuring points → mapping/topics → dashboards/alarms → security baseline → acceptance & ROI review → roll-out plan.
Which KPIs are useful for temperature use cases?
SP tracking (setpoint deviation), stability (std. dev.), time over limit, heat-up/cool-down ramps, OEE impact from temperature-related downtime, energy per lot/batch.
How do I smartly integrate passive RTD/TC probes?
With suitable head transmitters (HART/RS-485/IO-Link) that provide linearization, sensor backup (dual RTD), and diagnostics — enabling stable IDs, telemetry, and remote parameterization.