Name: 51303940-250 HONEYWELL
Price: 5433 CNY
Availability: InStock

Description

Honeywell 51303940-250 Explosion-Proof Pressure Switch Installation‌

‌Certification:‌ ATEX II 2G Ex d IIC T6 / IECEx Ex d IIC T6 Gb

‌Pre-Installation Requirements‌

‌Mandatory Checks‌

‌Environmental Compliance‌
- Ambient temp: -40°C to +85°C (derate above 65°C)
- Humidity: ≤95% non-condensing
- Protection class: IP66 (NEMA 4X when conduit sealed)
‌Hazardous Area Verification‌
- Confirm zone classification matches rating:
  textCopy Code
  
  Gas Group IIC (Hydrogen, Acetylene) Temp Class T6 (≤85°C surface temp)

‌Mechanical Installation‌

‌Step 1: Process Connection‌

plaintextCopy Code

1. Mount via 1/2" NPT female process port

2. Apply thread sealant:

   • Permabond A136 (PTFE-free) for gas service

   • Loctite 577 for liquid media

3. Tightening torque: 40 ±5 N·m

4. Orientation: Sensing element downward (↓) to prevent condensate pooling

‌Step 2: Enclosure Mounting‌

‌Method‌	‌Specification‌
Wall mount	M8 bolts (stainless steel A2-70)
DIN rail	EN 50022-35×7.5 (optional kit)
Vibration isolation	Use isolator pad P/N 51304412

‌Electrical Wiring‌

⚠️ ‌Explosion Protection Measures‌

textCopy Code

[Conduit Entry]

• Use Ex d certified cable gland (e.g. CMP 20-20-NPT)

• Minimum thread engagement: 5 full turns

• Ground continuity: ≤0.1Ω between gland & enclosure

[Terminal Connections] Terminal Function Wire Gauge Torque 1 Common 14-22 AWG 0.6 N·m 2 Normally Open 3 Normally Closed

‌Wiring Practices‌

Separation: ≥50mm from power cables (>60V)
Shield treatment: Drain wire to earth terminal (PE)
Intrinsic safety: Use IS barrier Zener-Ex 937B if connected to PLC

‌Pressure Calibration‌

‌Initial Setup‌

iniCopy Code

Range: 0-250 psi (1.72 MPa)

Deadband: 15% fixed

Accuracy: ±1% FS

‌Calibration Sequence‌

textCopy Code

1. Apply 90% setpoint pressure

2. Adjust setpoint screw until contacts change state

3. Verify deadband:

   - ↑ Increasing pressure: Contact at SP

   - ↓ Decreasing pressure: Contact at (SP - 15%)

4. Seal adjustment screw with torque seal compound

‌Functional Testing‌

‌Safety Validation‌

Leak test: Apply 1.5× max pressure (375 psi) for 15 min → ≤5% drop
Contact rating verification:
textCopy Code

Resistive load: 10A @ 240V AC Inductive load: 1/2 HP @ 120V AC (L/R=40ms)
Dielectric strength: 1500V AC for 1 min (terminal to ground)

‌Certification Compliance‌

textCopy Code

Standard         Requirement               Evidence

IEC 60079-0      Impact test IK10         Marking: ◆ 0084

ATEX Annex III   QAN verification          Doc: EU-TYPE 2021/1234

NEC 500          Class I Div 1             UL File: MH29619

♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦♦…♦

Shipping:
1. Your item will be shipped to all countries via EMS, unless one country cannot be shipped via EMS. We will choose DHL, UPS, or FedEx. Please leave us your phone number.
2. We will ship the product to you on the same day or within 1-2 working days after receiving your payment. The shipping time depends on the country/region where you reside, the customs and habits of your country/region, and especially during peak hours.
3. Assuming (assuming) that the item requires payment of tariffs from your country, the buyer is obligated. We are not responsible for any taxes or customs fees in your country/region.

Return Policy:
1. Please contact us before returning the item.
2. The buyer should inform the seller of all returned items within 7 days after receiving the package. We reserve the right to reject any request to inform the seller for more than 7 days.
3. Returned products must have all original packaging and be in good condition.

Response policy:
If you are satisfied with the purchase, please leave us an active response.
2. If you have any questions about the outcome of the transaction or product, please contact us first and we will do our best to satisfy you!
3. Please do not reply with negative feedback before contacting us!