Contactor,circuit breaker,solar inverter,electric meter,solar batteries
| Code Segment | Meaning | Remarks |
| DPSN | Product series code | Honeywell Air Differential Pressure Switch series |
| 250 | Range identifier | The actual standard model is 200 (20~200Pa); 250 is likely a typo |
| A | Version code | Standard version, no special functions |
| HONEYWELL | Brand | Honeywell (U.S. industrial automation giant) |
- Core Specification Parameters
Basic Parameters
| Parameter | Value | Description |
| Product Type | Air Differential Pressure Switch | Used for monitoring duct filters, fan operation and airflow status |
| Pressure Range | 20~200 Pa | Standard DPSN200A adjustable range |
| Switch Differential Pressure | 10 Pa (average) | Pressure difference between actuation and reset |
| Max Working Pressure | 10,000 Pa (10 kPa) | Ultimate withstand pressure |
| Accuracy | ≤±15% | Measurement accuracy |
| Measured Medium | Air, non-flammable and non-corrosive gas | Not applicable for other media |
Electrical Parameters
| Parameter | Value | Description |
| Switch Rating | 1.5 A (0.4 A)/250 VAC | Rated electrical load capacity |
| Electrical Connection | AMP connector or screw terminal | Two optional connection methods |
| Ingress Protection | IP54 | Dustproof and splashproof, suitable for industrial environments |
| Certification | CE | Compliant with European safety standards |
Mechanical & Environmental Parameters
| Parameter | Value | Description |
| Pressure Port Connection | 2 plastic tubes, 6 mm diameter | For connecting pressure sampling tubes |
| Cable Gland Size | CM = M20 × 1.5 | Cable interface dimension |
| Diaphragm Material | Silicone | Sensing element material |
| Mechanical Life | >1,000,000 cycles | High durability |
| Operating Temperature | -20℃ to 85℃ | Wide temperature range |
| Storage Temperature | -40℃ to 85℃ | Storage ambient condition |
| Overall Dimension | Ø85.5 mm × 107 mm | Round structure for easy installation |
| Mounting Holes | 4-ϕ3.6 mm | Fixing mounting holes |
- Accessory List
| Accessory Name | Quantity | Purpose |
| PVC Pressure Hose | 2 meters | Connect differential pressure switch to air duct |
| Pressure Sampling Tube | 2 pcs | Connect pressure ports |
| Mounting Screws | 5 pcs | Fix mounting bracket and main unit |
| L-type Mounting Bracket | 1 pc | Support multiple installation angles |
| Installation Manual | 1 copy | Guide correct installation and commissioning |
- Competitor & Cross-Brand Replacement Comparison
| Brand | Model | Main Difference | Application Scenario |
| Honeywell | DPSN200A (Standard Model) | Original genuine, ±15% accuracy, IP54 protection | All applications requiring DPSN250A |
| Honeywell | DPS200 | Same series standard type, slight structural difference | General air duct monitoring |
| Johnson Controls | P74JA-1 | Pressure range 15~200Pa, ±10% accuracy | HVAC systems with high precision requirements |
| Siemens | QBM81-3 | Adjustable range 0~500Pa, IP54 | Matching Siemens building automation systems |
| Schneider Electric | A9F72200 | 20~200Pa range with LED indicator | Applications requiring status visualization |
- Selection Guidelines & Replacement Solutions
- Key Selection Parameters
Confirm Pressure Range: Select according to actual duct differential pressure (20~200Pa for general filter monitoring)
Electrical Load Matching: Ensure switch rating meets control loop current requirement (≤1.5A/250VAC)
Installation Environment: IP54 suitable for non-humid industrial environments; additional protection required for outdoor use
Connection Method: Choose AMP connector or screw terminal based on site wiring requirements
- Recommended Replacement Solutions
Direct OEM Replacement: Prioritize DPSN200A (standard model) to avoid model confusion
Range Expansion: For higher pressure requirements, select DPSN400A (40~400Pa) or DPSN1000A (200~1000Pa)
Function Upgrade: Choose alternative models with LED status indicator for convenient on-site diagnosis
Cost-Effective Alternative: Domestic brands such as Chint and Delixi, price about 1/3~1/2 of OEM, performance meets general applications
- Installation Precautions
- Vertical mounting is standard; range value increases by 20Pa when mounted horizontally
- Avoid bending pressure sampling tubes; maximum length no more than 2 meters
- Connect pressure port +P1 to high-pressure side, -P2 to low-pressure side
- Electrical wiring shall comply with safety regulations to prevent short circuit
Honeywell Air Differential Pressure Switch Model List & Selection Guide
- Product Series Overview
Honeywell air differential pressure switches are mainly divided into 4 core series, covering general HVAC to heavy-duty industrial applications. All feature high reliability, long service life and IP54 ingress protection, suitable for duct filter monitoring, fan status detection and airflow control.
| Series | Positioning | Structural Features | Typical Applications |
| DPS Series | General Air Differential Pressure Switch | Standard round design, manually adjustable | Commercial building HVAC, filter monitoring |
| DPSN Series | Economy Air Differential Pressure Switch | Simplified design, cost optimized | Ordinary ventilation systems, basic filter monitoring |
| DPSP Series | High Precision Air Differential Pressure Switch | Precision adjustment, low hysteresis | Clean rooms, laboratories, medical facilities |
| AFS Series | Airflow Proof Switch | Used with sampling tubes, measures positive/negative pressure | Fire smoke exhaust system, damper status monitoring |
- Detailed Model List by Series
- DPS Series (Standard Air Differential Pressure Switch)
Core Features: Manually adjustable setpoint with Pa scale dial, 180° rotatable pipe inlet, CE certified, IP54 protection
| Model | Pressure Range (Pa) | Switch Differential (Pa) | Max Working Pressure (Pa) | Application Scenario |
| DPS 200 | 20~200 | 10 | 10,000 | General filter, small fan |
| DPS 400 | 40~400 | 20 | 10,000 | Medium filter, fan status |
| DPS 1000 | 200~1000 | 50 | 10,000 | Large air duct, high wind speed system |
| DPS 2500 | 500~2500 | 150 | 10,000 | High differential pressure system, industrial ventilation |
| DPS 200A | 20~200 | 10 | 10,000 | Standard type with AMP connector |
| DPS 400A | 40~400 | 20 | 10,000 | Standard type with AMP connector |
| DPS 1000A | 200~1000 | 50 | 10,000 | Standard type with AMP connector |
| DPS 2500A | 500~2500 | 150 | 10,000 | Standard type with AMP connector |
- DPSN Series (Economy Air Differential Pressure Switch)
Core Features: Simplified structure, cost-effective, manual adjustment and IP54 protection, ideal for budget-sensitive projects
| Model | Pressure Range (Pa) | Switch Differential (Pa) | Electrical Connection | Remarks |
| DPSN 200A | 20~200 | 10 | AMP / Screw Terminal | Most common model, replaces DPSN250A |
| DPSN 400A | 40~400 | 20 | AMP / Screw Terminal | Medium system application |
| DPSN 1000A | 200~1000 | 50 | AMP / Screw Terminal | Large air duct monitoring |
| DPSN 2500A | 500~2500 | 150 | AMP / Screw Terminal | High differential pressure industrial use |
- DPSP Series (High Precision Air Differential Pressure Switch)
Core Features: Higher accuracy (≤±10%), lower switch differential pressure, suitable for strict pressure control scenarios
| Model | Pressure Range (Pa) | Accuracy | Switch Differential (Pa) | Application Scenario |
| DPSP 100 | 10~100 | ≤±10% | 5 | Clean rooms, laboratories |
| DPSP 200 | 20~200 | ≤±10% | 8 | Medical facilities, precision air conditioning |
| DPSP 500 | 50~500 | ≤±10% | 15 | Pharmaceutical industry, electronic workshops |
- AFS Series (Airflow Proof Switch)
Core Features: Detects positive / negative / differential pressure; used with sampling tubes for fire protection and energy management systems
| Model | Pressure Range (Pa) | Reset Mode | Application Features |
| AFS 100 | 25~100 | Manual / Auto | Damper status monitoring |
| AFS 200 | 50~200 | Manual / Auto | Fire smoke exhaust system |
| AFS 500 | 100~500 | Manual / Auto | Airflow proof for large ventilation systems |
- Special Application Series
DPSL Series: Liquid & Gas dual-purpose differential pressure switch, suitable for neutral / slightly corrosive liquids and non-flammable gases, can be used as flow switch
| Model | Pressure Range | Medium Type | Ingress Protection |
| DPSL 06 | 0.2~6 bar | Liquid / Gas | IP65 |
| DPSL 16 | 0.5~16 bar | Liquid / Gas | IP65 |
| DPSL 40 | 1~40 bar | Liquid / Gas | IP65 |
- Model Naming Rule Explanation
Honeywell air differential pressure switch model consists of Series Code + Range + Version Code, clearly reflecting core parameters:
| Code Segment | Meaning | Example |
| DPS/DPSN/DPSP/AFS | Series code | DPS=Standard, DPSN=Economy, DPSP=High Precision, AFS=Airflow Proof |
| 200/400/1000/2500 | Range identifier | 200=20~200Pa, 400=40~400Pa, 1000=200~1000Pa, 2500=500~2500Pa |
| A | Version code | Standard version with AMP connector, screw terminal optional |
| Numeric Suffix | Special function | e.g. 06 in DPSL 06 means max 6 bar range |
- Core Specification Comparison Table
General Electrical Parameters (All Series)
| Parameter | Value | Description |
| Switch Rating | 1.5 A (0.4 A)/250 VAC | Rated electrical load capacity |
| Electrical Connection | AMP connector or screw terminal | Two optional connection methods |
| Ingress Protection | IP54 | Dustproof and splashproof for industrial environments |
| Operating Temperature | -20℃ to 85℃ | Wide temperature range |
| Storage Temperature | -40℃ to 85℃ | Storage ambient condition |
| Mechanical Life | >1,000,000 cycles | High durability |
| Pressure Port Connection | 2 plastic tubes, 6 mm diameter | For pressure sampling tube connection |
| Cable Gland Size | CM = M20 × 1.5 | Cable interface dimension |
Series Range & Accuracy Comparison
| Series | Typical Range (Pa) | Accuracy | Switch Differential (Pa) | Applicable Scenario |
| DPS | 20~2500 | ≤±15% | 10~150 | General HVAC systems |
| DPSN | 20~2500 | ≤±15% | 10~150 | Economy HVAC systems |
| DPSP | 10~500 | ≤±10% | 5~15 | High precision control occasions |
| AFS | 25~500 | ≤±15% | 10~30 | Airflow proof & fire protection systems |
- Selection Guidelines & Replacement Solutions
- Key Selection Parameters
Pressure Range Matching: Select based on actual duct differential pressure (20~200Pa for filter monitoring; 40~400Pa for large fans)
Accuracy Requirement: ≤±15% for general use (DPS/DPSN); ≤±10% for high precision (DPSP)
Electrical Load: Ensure switch rating meets control loop current (≤1.5A/250VAC)
Installation Environment: IP54 for non-humid industrial areas; extra protection required for outdoor installation
Connection Method: Select AMP connector or screw terminal according to site wiring
- Recommended Replacement Table
| Original Model | Direct Replacement | Function Upgrade Model | Budget Alternative |
| DPSN250A | DPSN200A (Standard) | DPSP200 (High Precision) | Domestic Chint / Delixi |
| DPS200 | DPS200A (With AMP Connector) | DPSP200 (High Precision) | Johnson Controls P74JA-1 |
| DPS400 | DPS400A | DPSP500 | Siemens QBM81-3 |
| DPS1000 | DPS1000A | DPSP500 | Schneider A9F72200 |
- Installation Precautions
- Vertical mounting is standard; horizontal mounting will increase range value by 20Pa
- Avoid bending sampling tubes; length shall not exceed 2 meters
- Connect +P1 to high-pressure side, -P2 to low-pressure side
- Electrical wiring must comply with safety standards to avoid short circuit
- Adjust setpoint only after system runs stably to ensure accurate measurement
- FAQ
- Difference between DPSN250A and DPSN200A: DPSN250A is non-standard; the actual standard model is DPSN200A (20~200Pa), 250 is a typo.
- How to choose the correct range: 20~200Pa for filter monitoring; 40~400Pa for fan status; 200~1000Pa or higher for large industrial ducts.
- IP54 Protection Definition: Dust-tight and protected against splashing water, suitable for indoor industrial environments.
