SIEMENS QAE2112.010 Immersion Temperature Sensor

Passive Insertion/Immersion Water Temperature Sensor of Symaro Series

Core element: Pt1000 (Class B per IEC751). Designed for siemes HVAC and Building Management Systems (BMS) to measure liquid temperature in pipelines and water tanks. It does not come with an integrated thermowell and must be installed with a separate thermowell.

Full order code: BPZ:QAE2112.010

1. Especificações Técnicas Principais

III. Explicação do código do modelo

QAE2112.010

QAE: Series of immersion/insertion temperature sensors

21: Symaro general-purpose water temperature measurement

1: No integrated threaded thermowell; external thermowell fixed by clips

2: Pt1000 sensing element

010: Immersion length 100mm

Comparison of derivative models in the same series:

1. QAE2112.015: Pt1000, 150mm immersion length
2. QAE2111.010: Pt100, 100mm immersion length
3. QAE2120.010: Built-in G½ threaded thermowell, LG-Ni1000
4. Cenários típicos de aplicação
5. Supply/return water temperature monitoring for heating systems & temperature control of mixing valves
6. Temperature collection for chilled and hot water pipelines in central air conditioning
7. Water temperature measurement for domestic hot water tanks and boilers
8. Over-temperature protection for underfloor heating, heat exchange stations and fan coil units
9. Matching Siemens DDC controllers (PXC, RWG series, etc.) for building BMS systems
10. Key Installation Specifications
11. Thermowell Mandatory: Original ALT-SS100 stainless steel G½ thermowell is recommended. Weld G½ threaded seats on pipelines in advance. A minimum probe insertion depth of 60mm is required to guarantee measuring accuracy.
12. Posição de montagem: Install 1.5~2m downstream of pump outlets or mixing valves with the probe facing the incoming water flow. The cable terminal side must not face upward to prevent water ingress.
13. Response Optimization: Apply thermal grease between thermowell and probe to reduce thermal resistance.
14. Fiação: Direct 2-wire connection to Pt1000 input terminals of DDC controllers (non-polarized). Shielded twisted pair cable is recommended to minimize interference.
15. Fiação & Compatibilidade

Saída: Pure passive resistance signal. Only compatible with controllers supporting Pt1000 input.

Compatible Siemens Controllers: RWG16, PXC series, Climatix controllers

Not Directly Replaceable: Pt100 models (QAE2111), 4-20mA active transmitters (QAE2174)

VII. List of Matching Accessories (Separate Purchase Required)

1. ALT-SS100: G½ stainless steel protection thermowell (Standard fit for 100mm probes)
2. Thermal grease: Improves temperature measurement response speed
3. M16 sealing cable gland (Upgrades protection class to IP54)

VIII. Guia de solução de problemas

Complete Technical Datasheet of SIEMENS QAE2112.010 Immersion Temperature Sensor

1. Basic Model Information

Material Model No.: QAE2112.010

Série de produtos: Symaro QAE21 Passive Insertion / Immersion Temperature Sensor

Tipo de produto: Liquid temperature probe for water pipelines and tanks (No integrated thermowell; separate protection thermowell required for installation)

Código do pedido: BPZ:QAE2112.010

Segment-by-Segment Model Definition

1. Core Sensing & Accuracy Parameters
2. Temperature Sensing Core

Element: Pt1000, compliant with Class B accuracy per IEC 60751

Faixa de medição: -30 ℃ ~ +130 ℃

Measuring Error: ±0.95 K (Gama completa)

2. Response Time Constant

Without protection thermowell: τ₀.₅ ≈ 8 é

With standard stainless steel thermowell: τ₀.₅ ≈ 30 é

3. Passive Signal Characteristics

Pure resistive passive output with no external power supply required. Directly connect to resistance thermometer input modules of Siemens DDCs, thermostats and PLCs.

III. Estrutura Mecânica & Dimensões

1. Probe Specifications

Effective immersion length: 100 milímetros

Shaft Material: Aço inoxidável

Nominal pressure of matched thermowell: PN3 (Max pressure 3 bar)

2. Wiring Housing

Housing Size: 80×60×31 mm (C×L×A)

Saída de cabo: M16 cable gland

Método de fiação: Screw-clamp terminals for 0.5～1.5 mm² cables

Classe de Proteção: IP42; IP54 with sealing cable gland accessory

3. Operating Ambient Conditions

Allowable ambient temperature for housing: -40 ℃ ~ +70 ℃

Compatible Media: Cold water, água quente, glycol HVAC circulating water, domestic hot water

1. Mandatory Installation Accessories (Optional Purchase)

This model does not include G1/2 threaded protection thermowell. Thermowell assemblies must be ordered separately:

1. Standard protection thermowell: ASZ-100 (G1/2 external thread, fits 100mm probes, PN10 pressure rating)
2. Locking clip: Secures probe to thermowell to prevent loosening or detachment
3. Cabo: 3-cabo blindado com núcleo (Standard 3-wire wiring for Pt1000)
4. Electrical Wiring Rules (3-Wire System)

3-wire Pt1000 connection eliminates measurement error caused by cable resistance:

terminal 1: One end of resistance element

Terminais 2 & 3: Two parallel wires from the other resistance end to the controller

Compatible Siemens Controllers: RWD62/RWD68, Synco700, Desigo PXC series, Building DDC

1. Same-Series Model Differentiation & Opções de substituição

Comparison of Similar Models in Series

Direct Replacement Solutions

1. Extended Pt1000 version with identical specs: QAE2112.015 (150mm immersion length for thick pipeline walls)
2. Integrated pre-assembled version without separate thermowell: QAE2120.010 (Nickel resistance; controller must support Ni1000 signal)
3. Cost-effective Pt100 variant: QAE2111.010 (Only applicable if controller supports Pt100 input)

VII. Cenários típicos de aplicação

AVAC & Building Management BMS Systems:

1. Supply/return water temperature monitoring for chillers
2. Hot water measurement for boilers and plate heat exchangers
3. Over-temperature protection for underfloor heating and fan coil units
4. Constant temperature control for domestic hot water tanks and pipelines
5. Temperature collection for industrial process cooling water

VIII. Strict Installation Prohibitions

1. Never immerse the bare probe directly into pipeline fluid without thermowell — risk of corrosion and non-detachable replacement.
2. Medium pressure shall never exceed PN3. Select QAE2120 series with PN10 integrated thermowell for high-pressure pipelines.
3. At least 90% of the probe shaft must be fully submerged in fluid; incomplete immersion leads to severe temperature deviation.
4. Do not route sensor cables in the same trunking as power cables. Single-end earthing of shielding layer reduces electromagnetic interference.
5. Medium temperature shall not exceed 130℃ even temporarily. High-temperature applications require high-temperature resistant thermowells.
6. Consumable Matching Spare Parts
7. ASZ-100 Stainless Steel Temperature Thermowell G1/2
8. M16 Sealing Cable Gland (Upgrade to IP54 protection)
9. PTFE sealing tape for thermowells, high-temperature gaskets

Shaft Material of SIEMENS QAE2112.010

Sondar (Immersion Shaft) Material: Aço inoxidável

Notas Suplementares

1. All QAE21xx series sensors (QAE2111, QAE2112, QAE2120, etc.) adopt uniform stainless steel immersion shafts, resistant to corrosion from HVAC cold/hot water and glycol circulating water, suitable for medium temperatures ranging from -30℃ to +130℃.
2. Distinction between two components:

Original thin probe shaft of sensor: Aço inoxidável (Factory-fitted, 100mm length)

External optional protection thermowell ASZ-100: Also stainless steel with G1/2 thread and PN10 pressure rating. Mandatory for pipeline installation; never submerge bare shaft directly in pipeline fluid.

3. Material da Habitação: ASA engineering plastic (Off-white housing), IP42 protection class.

Application Scenarios of SIEMENS QAE2112.010 (Pt1000 Immersion Water Temperature Sensor)

1. HVAC Heating Systems (Most Common Use Cases)
2. Temperature Measurement at Boiler / Heat Source Side

Collect supply and return water temperature of gas/oil hot water boilers to interlock boiler start/stop, proportional regulation and over-temperature protection.

2. Plate Heat Exchange Stations

Monitor supply & return water of primary municipal heating network and secondary heating loop for automatic temperature control, constant temperature & pressure regulation of heat exchange units.

3. Underfloor Radiant Heating

Collect supply/return water temperature of manifold assemblies to interlock mixing centers, prevent floor overheating and stabilize supply water temperature.

4. Radiator Heating Systems

Water temperature monitoring for building risers and branch pipes to support zoned or household independent temperature regulation.

1. Central Air Conditioning Water Systems
2. Chilled Water System of Chillers

Acquire chilled supply and return water temperature to calculate temperature difference, control chiller loading/unloading and variable frequency pump speed adjustment.

2. Cooling Water Systems

Measure cooling supply & return water temperature to interlock cooling tower fan start/stop and variable frequency regulation for unit energy saving.

3. Fan Coil Units / Air Handling Units

Temperature measurement of chilled/hot water pipelines for air conditioning, cooperating with 2-way & 3-way motorized valves to realize room constant temperature control.

4. Air Handling Units (AHU)

Monitor inlet & outlet water temperature of heating and cooling coils, automatically adjust valve opening to stabilize supply air temperature.

III. Domestic Hot Water & Swimming Pool Systems

1. Domestic Hot Water Tanks / Storage Water Heaters

Immersed temperature measurement inside tanks and hot water circulation pipelines to control circulation pump and heating equipment operation for all-day constant hot water supply.

2. Hot Water Pipe Networks for Hotels & Apartments

Temperature monitoring of main and branch hot water pipes to reduce heat loss and balance hot water temperature across floors.

3. Constant-Temperature Swimming Pool Systems

Measure pipeline temperature of pool heat exchangers to maintain steady pool water temperature and interlock plate heat exchangers for heating.

1. Industrial Process Water Systems
2. Process Cooling Water for Workshops

Temperature monitoring of cooling circuits matched with injection molding machines, machine tools and air compressors, triggering over-temperature alarms and equipment interlock shutdown.

2. Purified Water / Process Hot Water in Cleanrooms

Temperature measurement of cleanroom HVAC hot water and process circulating water to meet constant-temperature process requirements of pharmaceutical and electronic workshops.

3. Waste Heat Recovery Systems

Temperature detection for waste heat recovery tanks and circulation pipelines to automatically switch recovery/heating modes for energy-efficient operation.

1. BMS & Energy Metering Applications
2. Building Energy Consumption Monitoring

Collect temperature difference between supply and return pipes of cooling/heating networks. Calculate cooling & heat energy consumption with flow meters for itemized energy statistics.

2. Support for Building DDC Automation Systems

Fully compatible with Siemens PXC, RWG and Climatix series controllers as standard water temperature measuring points.

3. Intelligent Pump Room Monitoring

Fornecer & return water temperature measurement of primary and secondary pumps for pump variable frequency optimization and pipeline anti-freeze alarming.

1. Auxiliary Temperature Control & Protection for Supporting Equipment
2. Solar Hot Water Systems

Measure outlet temperature of solar collectors and storage tanks to control circulation pump operation and realize solar temperature-difference circulation.

2. Anti-Freezing Monitoring

Detect temperature of buried outdoor heating pipelines and roof chilled water main pipes; automatically activate heat tracing and circulation pumps when temperature drops below setpoint for freeze protection.

3. Temperature Sensing for Constant-Temperature Mixing Valves

Collect mixed outlet water temperature for closed-loop regulation of cold/hot water inlet ratio to stabilize outlet temperature and prevent scalding.

Restricted & Cenários Inaplicáveis

1. Steam pipelines and high-temperature flue gas (Max measuring range 130℃, not suitable for steam service)
2. Direct insertion into high-pressure liquid without thermowell (G1/2 thermowell is mandatory)
3. Liquids with strong acid/alkali corrosion (Standard stainless steel shaft requires anti-corrosion thermowell replacement)
4. Air duct temperature measurement (Use QAM series duct temperature sensors instead; cross-use prohibited)