Rilevatore di gas combustibili Honeywell 2108N4000H

Honeywell Searchpoint Optima Plus (2108N4000H) Colpa & Warning Troubleshooting Table

Reading methods: HART 475/375 Communicator, SHC1 Handheld Interrogator, EDD Device Description File; W=Warning, F=Fault. Under fault condition, output defaults to 0mA (this HART version can be set to 1mA). Some faults are latched and require manual clearing or power cycle reset.

📌 Common General Faults (No independent Error ID in HART)

1. HART Communication Failure

Controllo: 250Ω HART resistor must be installed on the loop; correct polarity; single-end shield grounding; no excessive non-HART devices on the bus; matching baud rate.

2. Slow reading drift with no error code

Controllo: overdue calibration; clogged dust filter; continuous low-level hydrocarbon interference; heavy oil adsorption inside gas cell.

3. No current output & no communication after power-on

Controllo: ingresso di acqua & terminal corrosion in M25 junction box; burnt circuit due to reverse polarity; fusibile interno bruciato.

🛠️ Operation Guidelines (for 2108N4000H)

1. Clear Latched Faults: HART menu →【Fault/Warning】→Clear; or power off ≥30 seconds then restart. Hardware faults will reoccur immediately after reset; do not mask them permanently.
2. Calibration Precondition: Clear all optical path & lamp warnings before zero/span calibration; calibration will drift severely with active optics contamination warning.
3. Spare Parts Division: Errore 8,11,16 = optical module (lampada + detector + lens); Error5,13,22 = main board failure. Board-level repair is not recommended; replace the whole transmitter directly.
4. SIL2 Reminder: F-class faults trigger SIL safety loop action. Do not run the detector with fault masked for long; rectify promptly.

(Searchpoint Optima Plus)

Posizione del prodotto: Point-type NDIR hydrocarbon combustible gas detector, HART protocol version

Manufactured by Honeywell Analytics UK. NDIR infrared principle, immune to catalytic bead poisoning. Ideal for offshore platforms, refineries, LNG and other harsh environments; Livello di integrità della sicurezza SIL2.

✅ Model Coding Definition

2108: Searchpoint Optima Plus series

N: Hydrocarbon HC version (metano, propane, gasoline etc., il tuo modello)

4: Standard diffusion type with weather shield

000: Without remote gas cell & sampling path

H: HART 7 protocol superimposed on 4-20mA signal (suffix N = pure 4-20mA without HART, per esempio. 2108N4100N)

Filo: M25 (distinguished from 41xx series with 3/4″Filettatura NPT)

Configurazione standard: 316L electropolished stainless steel housing, dust filter, nylon weatherproof cover, sunshade against rain splash.

📌 Key Technical Specifications

✨ Infrared vs Catalytic Bead Advantages

1. Resistant to catalytic poisons (silicone, lead, H₂S), longer service life and extended maintenance interval
2. Fail-safe optical self-test; no silent failure risk
3. Works normally in inert atmosphere (catalytic sensors require oxygen)
4. Built-in temperature control heating; anti-condensation optical window; pre-warning for lens contamination
5. Onboard event log; support HART communicator for commissioning, calibration and diagnostics

🧾 Typical Application Scenarios

Offshore oil & gas platforms, FPSO, oil tankers, refineries, LNG/LPG filling stations, gas regulator stations, gas turbine power plants, solvent coating & printing workshops, tank farms.

📎 Cross-model Reference (for replacement & selezione)

2108N4000H: M25 thread, HART, diffusion type with weather shield (your unit)

2108N4100N: 3/4″TNP, pure 4-20mA, no HART

2108N4100H: 3/4″TNP, HART version

2108N5100H: Flow-through sampling type with HART, for pipeline sampling systems

⚠️ Important Notes

1. Infrared detector only responds to hydrocarbons; cannot detect non-hydrocarbon flammable gases such as H₂, CO, NH₃.
2. Calibration gas must match target gas; response factor varies for different hydrocarbons.
3. Cannot directly replace catalytic bead sensors without rechecking host logic and alarm thresholds.
4. Pezzi di ricambio consumabili: optical module, dust filter and weather shield are regular wear items.

Honeywell Searchpoint Optima Plus (2108 Serie) Elenco completo dei modelli

1. Regole di codifica del modello

2108N: Standard Hydrocarbon (HC) versione (metano, propane, gasoline etc.)

2108B: Ethylene & solvent dedicated version (ethylene, aromatics, esters)

4esima cifra: 4 = Diffusion type; 5 = Flow-through sampling type (with gas cell)

Thread code: 0 = M25; 1 = 3/4″TNP

Suffisso: N = 4-20mA only; H = 4-20mA + HART7 protocol

Suffisso 10 = with Remote Gas Cell (RGC); 00 = without remote gas cell

2. 2108N Hydrocarbon Standard Models (Serie principale, including 2108N4000H)

2.1 M25 thread (0) | Diffusion (4) | No RGC (00)

1. 2108N4000N: 4-20mA, M25, diffusion, weather shield
2. 2108N4000H: 4-20mA+HART, M25, diffusion (il tuo modello)
3. 2108N4001N: Ethylene calibrated, M25, diffusion, 4-20mA
4. 2108N4001H: Ethylene calibrated, M25, diffusion, HART
5. 2108N4010N: HC + RGC remote test cell, M25, diffusion
6. 2108N4010H: HC + RGC, M25, diffusion, HART

2.2 3/4″Filettatura NPT (1) | Diffusion (4) | No RGC (00)

7. 2108N4100N: 4-20mA, TNP, diffusion
8. 2108N4100H: 4-20mA+HART, TNP, diffusion
9. 2108N4110N: With RGC, TNP, diffusion
10. 2108N4110H: With RGC, TNP, diffusion + HART

2.3 Flow-through sampling type (5) for sampling pipeline & pre-treatment systems

M25 thread (0)

11. 2108N5000N: Flow gas cell, M25, 4-20mA
12. 2108N5000H: Flow gas cell, M25, HART
13. 2108N5010N: Flow type + RGC, M25
14. 2108N5010H: Flow type + RGC, M25 + HART

3/4″Filettatura NPT (1)

15. 2108N5100N: Flow gas cell, TNP, 4-20mA
16. 2108N5100H: Flow gas cell, TNP, HART
17. 2108N5110N: Flow type + RGC, TNP, high concentration range (0~100%vol CH₄)
18. 2108N5110H: Flow type + RGC, TNP + HART

2.4 Special XTC Marine & Multi-certified Models (44/46/48 serie)

19. 2108N4400N / H: Diffusion, certificazione marina, M25
20. 2108N4600N / H: Diffusion, UL/FM certified, M25
21. 2108N4601N / H: Ethylene calibrated, 46-type diffusion
22. 2108N4800N / H: Optima Plus XTC version, M25 diffusion
23. 2108N5400/5600/5800 N/H: Corresponding flow-through versions (44/46/48 sampling models)
24. 2108B Ethylene & Solvent Dedicated Models (for Optima X/Z sampling systems)

Diffusion type (4)

1. 2108B4001N / H: Ethylene calibrated, M25 diffusion
2. 2108B4101N / H: Ethylene calibrated, NPT diffusion

Flow-through sampling type (5, only for sampling systems)

3. 2108B5001N / H: Ethylene flow cell, M25
4. 2108B5101N / H: Ethylene flow cell, TNP
5. 2108B2001N / H: Optima X fast-response sampling model (special gas cell)
6. 2108B2051N: DNV marine certified version
7. Full Series Spare Part Order Codes
8. Optical Module: 2108D3001 (Methane), 2108D3034 (Ethylene)
9. Remote Gas Cell (RGC): 2108B0240
10. Flow-through Gas Cell Assembly: 2108B0282
11. Dust Filter + Weather Shield: 2108B2337
12. terminale & Junction Box: 2108B2360
13. Tabella di selezione rapida (for replacement)

6. Osservazioni supplementari
7. N = 4-20mA analogue only; H = HART enabled. Do not mix loop types; 250Ω resistor is mandatory for HART loops.
8. 2108N only detects hydrocarbons; 2108B is dedicated for ethylene, esters and alcohols. Neither can detect H₂, CO or NH₃.
9. All models meet SIL2, ATEX/IECEx/FM certification; IP67 ingress protection.