Description
The Siemens SITRANS QAM2120.040 / QAM2120.200 / QAM2120.600 / QAM2110.040 / QAM2112.040 are passive immersion / duct temperature sensors designed for HVAC and building automation (HVAC BMS) applications. They consist of a Pt100 or Pt1000 RTD element mounted in a stainless steel or brass immersion well, with a probe length of 0.04 m (40 mm), 0.20 m (200 mm), or 0.60 m (600 mm) inserted into the air duct or pipe (via welded socket / compression fitting).
- QAM2120.xxx → Pt100 (IEC 60751Class B, 2-wire or 3-wire — check suffix detail)
- QAM2110.xxx → Pt1000 (IEC 60751Class B, typically 2-wire)
- QAM2112.xxx → Pt1000 with LG-Ni1000 characteristic option (some BMS systems — check region)
These sensors connect directly to Siemens RWD / RX / PXC / Desigo room/duct controllers or any PLC with RTD analog input. They are passive — no external supply needed for the sensor element itself.
Key Features
- Element Type: Pt100 (QAM2120), Pt1000 (QAM2110 / QAM2112) — IEC 60751Class B.
- Probe Lengths: 40 mm (.040), 200 mm (.200), 600 mm (.600).
- Immersion Well: Stainless steel (AISI 304/316), Ø6 mm or Ø8 mm — solder / weld into duct collar.
- Connection: 2 × or 3 × PVC insulated leads (typically 1.5 m cable — silicone or PVC) to terminal block.
- Measuring Range: Typically -30 … +120 °C (air duct); element itself -50 … +200 °C.
- Country of Origin: Germany / Austria (Siemens Building Technologies)
Model & Specification Table
Model | Sensor Element | Probe Length | Typical Application |
|---|---|---|---|
QAM2120.040 | Pt100 (Class B) | 40 mm | Small duct / compact insertion |
QAM2120.200 | Pt100 (Class B) | 200 mm | Standard air duct (mid-size) |
QAM2120.600 | Pt100 (Class B) | 600 mm | Large duct / deep insertion |
QAM2110.040 | Pt1000 (Class B) | 40 mm | BMS with Pt1000 input (Desigo etc.) |
QAM2112.040 | Pt1000 / LG-Ni1000* | 40 mm | Legacy BMS preferring LG-Ni char. (*verify region) |
💡 Pt100 vs Pt1000:
Technical Specifications (Representative — QAM2120.200, Pt100, 200 mm Probe)
Parameter | Specification |
|---|---|
Model / Order Code | QAM2120.200 (Siemens SITRANS HVAC Duct Sensor) |
Sensor Element | Pt100 (IEC 60751 Class B) — optionally Pt1000 (QAM2110.xxx) |
Measuring Range (Medium) | -30 … +120 °C (air duct typical); element -50 … +200 °C |
Probe Length (Immersion) | 200 mm (also avail. 40 mm / 600 mm) |
Probe Diameter | Ø 6 mm (typical) or Ø 8 mm — stainless steel AISI 304/316 |
Well Type | Closed-end immersion well (soldered/welded into duct sleeve) |
Output Signal | Passive resistance — requires 2-wire (less accurate) or 3-wire (recommended) connection to controller RTD input |
Accuracy | ±0.3 °C @ 0 °C (Class B — ±0.12% × |
Cable Outlet | PVC insulated leads (2× or 3× 0.75 mm², 1.5 m typical — silicone for high temp) |
Mounting | Insert into duct via soldered/welded socket (sold separately as AM.. series or generic compression fitting) |
Ambient (Electronics/Cable) | -30 … +70 °C |
Ingress Protection | IP54 (cable entry); IP65 (sensor well when properly installed) |
Standards | CE, IEC 60751, RoHS |
Warranty & After-Sales
- Factory new units: 12 months warranty
- Refurbished units: 3-6 months warranty (where offered)
- Technical support for:
- Pt100 vs Pt1000 selection per your BMS/controller analog input type
- 2-wire vs 3-wire wiring (3-wire recommended for Pt100 > 10 m cable)
- Duct socket / compression fitting recommendation (AM series or generic)
- Cross-reference vs. Siemens QAA / QAE room/outside sensors if needed
- Spare well / replacement insert availability check
Delivery Time
- Standard delivery: 3-5 working days (stock probe lengths)
- Express shipping available upon request
Why Choose Our Store
- Genuine Siemens Building Technologies (HVAC) sensors — not generic RTD probes with wrong time constant
- Global supply network with competitive pricing
- Expertise in HVAC BMS sensor selection (Desigo PXC / RWD series compatibility)
- Comprehensive technical documentation (insertion depth recommendation, resistance table, wiring diagram)
- Responsive customer service and support
Applications
- Air Duct Temperature Monitoring: AHU supply/return air temp. for economizer & heating/cooling control
- VAV / CAV Terminal Reheat Coil Temp. Sensing (short probe .040 or .200)
- Exhaust / Make-up Air Temp.: Large ducts use .600 probe
- Process Air Temp. in Non-hygienic Applications (food grade versions available on request)
- Retrofit of old pneumatic / electronic T-stat to DDC BMS
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