コンタクタ,サーキットブレーカー,ソーラーインバーター,電気メーター,太陽電池
Siemens QPL25.050B is a high-performance gas pressure switch. から次の範囲の中低圧監視用に設計されています。 5-50 ミリバール, IP54の保護等級と機械的耐用年数が特徴です。 100,000 サイクル. 燃焼システムの安全保護に広く使用されています. モデルパラメータをチェックする, システム要件との完全な互換性を確保するための調達時の圧力範囲と取り付けインターフェース.
- モデルコードの定義
| コードセグメント | 意味 | 説明 |
| QPL | 製品シリーズコード | Basic series of Siemens gas pressure switches for gas and air pressure monitoring |
| 25 | 構造 & 定格パラメータ | シリーズ 25, rated current 6A AC, rated voltage 250V AC/DC, IP54 protection |
| 50 | Pressure adjustment range | 調整範囲: 5-50 ミリバール (0.5-5.0 kPa) |
| B | Version mark | 標準タイプ, 自動リセット, SPDT contact configuration |
- コア仕様パラメータ
| カテゴリ | 仕様 | 備考 |
| 基本パラメータ | ||
| 製品タイプ | Mechanical gas pressure switch | Safety monitoring for combustion systems |
| 注文番号. | 1117087 | Official Siemens part number |
| Adjustment Range | 5-50 ミリバール (0.5-5.0 kPa) | Adjustable set point |
| 最高使用圧力 | 690 ミリバール (69 kPa) | Upper limit of continuous operating pressure |
| Switch Differential | 約. 5-10 ミリバール | Pressure difference between switch-on and switch-off |
| 電気的パラメータ | ||
| 定格電圧 | AC 250V / DC 250V | 最大動作電圧 |
| 定格電流 | AC 6A / DC 1A | 抵抗負荷 |
| 接点の種類 | SPDT | 1 通常は開いています + 1 通常は閉まっている |
| 電気接続 | Terminal box compliant with DIN EN 175 301-803 | クラス 3 絶縁保護 |
| 機械式 & 環境パラメータ | ||
| Pressure Port | G1/4 internal thread (ISO228) | Center position at bottom casing |
| Measuring Port | Ø9mm, 10mm length with locking screw | For pressure calibration |
| 周囲温度 | -20℃～+60℃ | 使用温度範囲 |
| 中温 | -40℃～+60℃ | Applicable gas temperature |
| 保護等級 | IP54 | 防塵・防水 |
| Mechanical Lifespan | 100,000 サイクル | Switch actuation times |
| Applicable Media | クラス 1/2/3 gases & non-corrosive gas | Natural gas, liquefied petroleum gas, 等. |
- Full QPL25 Series Model List
| モデル | 圧力範囲 | 最高使用圧力 | 備考 |
| QPL25.003B | 0.3-3 ミリバール | 690 ミリバール | Low pressure monitoring |
| QPL25.010B | 1-10 ミリバール | 690 ミリバール | Ultra-low pressure application |
| QPL25.050B | 5-50 ミリバール | 690 ミリバール | Standard medium-low pressure |
| QPL25.150B | 15-150 ミリバール | 690 ミリバール | Medium pressure monitoring |
| QPL25.500B | 100-500 ミリバール | 720 ミリバール | High pressure monitoring |
- Cross-brand Replacement Comparison
| ブランド | モデル | 圧力範囲 | 主な違い | 交換の提案 |
| シーメンス | QPL25.050B | 5-50 ミリバール | Original authentic product, 高い安定性 | Priority choice |
| ハネウェル | C6097A | 5-50 ミリバール | 低価格, similar response speed | 直接交換 |
| ダンフォス | KPI 36 | 5-50 ミリバール | Different mechanical structure, high adjustment precision | Verify mounting dimensions |
| Dungs | LGW50A2 | 5-50 ミリバール | German brand, 信頼できる品質 | 完全な互換性 |
| Baltur | PAMPA | 5-50 ミリバール | Burner dedicated, 費用対効果の高い | Suitable for Baltur combustion systems |
- Common Troubleshooting & メンテナンス
5.1 一般的な障害 & 原因
| 故障現象 | 考えられる原因 | トラブルシューティングの手順 |
| No switch action under normal pressure | Improper setpoint; oxidized/damaged contacts; aging/damaged diaphragm; 配線が緩んでいる | Recalibrate setpoint; test contact continuity; inspect diaphragm; fasten terminals |
| No switching under abnormal pressure | Excessive switch differential; mechanical stuck; spring fatigue | Adjust differential; clean moving parts; replace spring assembly |
| Frequent contact ablation | 過負荷; unstable voltage; mismatched contact material | 負荷電流を確認する; install surge suppressor; replace contact assembly |
| Inaccurate pressure reading | Blocked measuring port; deformed diaphragm; calibration error | Clean port; replace diaphragm; recalibrate with standard pressure source |
5.2 メンテナンスガイドライン
- Safety Precaution
Cut off gas supply and release pressure
Disconnect power supply
Cool down equipment to room temperature
- Calibration Procedure
① Remove protective cover and locate adjusting screw
② Connect standard pressure source and set target value
③ Clockwise rotation increases set pressure, counter-clockwise decreases
④ Test switching action and confirm accurate trigger point
⑤ Reinstall cover and ensure tight sealing
- Component Replacement
Diaphragm: Dismount with special tools, pay attention to gasket installation direction
接触: Replace whole switch module instead of single contact
春: Use identical specification spare part to guarantee precision
- アプリケーション環境 & 業界の事例
6.1 該当するシナリオ
✅ Recommended Applications
Safety monitoring for industrial & civil gas burners
Pressure protection system of gas boilers
Pressure control of natural gas pipelines
Gas supply system of industrial furnaces
Pressure monitoring for biogas power generation equipment
❌ Inadmissible Applications
High-pressure gas system over 690 ミリバール
Corrosive gas atmosphere
Medium temperature exceeding 60°C or below -20°C
Severe vibration and outdoor exposed installation without protection
6.2 Typical Industry Applications
| 業界 | 応用 | 関数 |
| 空調設備 | Commercial gas boiler | Monitor gas pressure to ensure combustion efficiency and safety |
| Food Processing | Baking furnace gas system | Avoid incomplete combustion caused by low pressure |
| エネルギー産業 | Biogas power station | Stabilize biogas pressure and protect generating units |
| 製造業 | Ceramic kiln | Precise temperature control via gas pressure regulation |
| Commercial Kitchen | Large cooking equipment | Safety interlock to prevent gas leakage accidents |
- 選択のヒント & Avoidable Risks
選択ニーモニック
QPL series for gas service, 25 stands for 6A rating
Last three digits define pressure range, B means standard auto-reset
050 model fits 5-50 ミリバール, G1/4 thread for installation
IP54 solid protection, match gas medium properly
重要なメモ
- Pressure Matching
Keep actual working pressure within 20%-80% of adjustment range to maintain accuracy.
- インストール要件
Mount vertically with diaphragm downward to avoid condensed water accumulation.
Install filter at pressure port to prevent internal impurity damage.
Secure wiring firmly to avoid false triggering.
- Safety Regulations
Interlock with gas leakage alarm device.
Conduct regular inspection and calibration every 6 月.
Perform pressure and leakage test after maintenance.
- Purchase Notice
Choose genuine Siemens products; counterfeit items have unstable quality.
Keep original package and certificate for after-sales service.
Working Principle of QPL25.050B
Core principle: Air pressure deforms diaphragm, mechanical linkage drives contact on-off to realize overpressure interlock protection
- Pressure Sensing
Gas flows into inner chamber through G1/4 port and acts on rubber diaphragm, driving axial displacement with pressure variation.
- Mechanical Force Balance
Diaphragm thrust counterbalances preset spring tension. Rotate adjusting screw to change spring preload and set trigger pressure threshold.
- Linkage Actuation
When pressure rises to set value, diaphragm overcomes spring resistance and pushes rod to drive lever mechanism. Spring rebounds when pressure drops below threshold.
- Contact Switching
Lever movement switches SPDT contacts, reverses circuit status and transmits electric signal for burner start-stop and alarm interlock.
- Differential Pressure Stabilization
Fixed pressure differential prevents frequent switching and unnecessary equipment startup/shutdown.
- リセットモード
Standard automatic reset; contacts recover initial state once pressure returns to normal range.
Application Scenarios of QPL25.050B
Applicable Sites
- Low pressure monitoring and protection for gas boilers and water heaters
- Supply pressure interlock control of oil and gas industrial burners
- Pressure stabilization detection for commercial kitchen stoves and hot air furnaces
- Medium-low pressure monitoring of natural gas and liquefied gas pipelines
- Safety protection for furnace and drying equipment gas supply
- Start-stop interlock for clean combustible gas such as biogas and coal gas
Forbidden Sites
- Gas pipelines with pressure higher than 690mbar
- Gas medium containing corrosion, dust and oil contaminants
- Ambient temperature below -20℃ or above 60℃
- Sites with fierce vibration and uncovered outdoor installation
