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Omega Flowmeter FLMH-3801
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Repeatability: ±1%
Flow Measuring Range: 0.4 - 560 lpm (0.1 - 150 gpm)
Maximum Operating Pressure:
Aluminum and brass monitors: 3500 psig (240 Bar)
Stainless steel monitors: 6000 psig (410 Bar) up to 116°C (240°F)
Maximum Operating Temperature:
Standard Models: 116°C (240°F)
High Temp (-HT) Models: 204°C (400°F) max
Ultra High Temp (-UHT) Models: 316°C (600°F) max
Pressure Differential: download spec sheet for pressure drop graphs
Standard Calibration Fluids:
Oil monitors: DTE 25 @ 43°C (110°F), 0.873 sg
Water monitors: tap water @ 21°C (70°F), 1.0 sg
Maximum Particle Size: 76 microns
Relay (Optional): 1 or 2 form “C” relays, rated 10 A @ 125 or 250 Vac or 0.25 A @ 250 Vdc
Mechanical Life: >107 cycles
Analog Output (Optional): Supply voltage 12 to 35 Vdc, field selectable for 0 to 5 Vdc (100 W minimum load), 0 to 2000 Hz square-wave pulse or 4 to 20 mA; Rmax = 50 (Vs-12). Vs = supply voltage DC
Installation Dimensions:
1/4 and 1/2 NPT Sizes: 1-7/8 OD x 6.6" length
3/4 and 1 NPT Sizes: 2-3/8 OD x 7.2" length
1-1/4 and 1-1/2 NPT Sizes: 3-1/2 OD x 10.1" length
Why Global Buyers Choose O&Kmarts
- Access to a wide range of SKUs across multiple brands and series
- One RFQ connects you to 5,000+ global supplier quotes
- Better availability for urgent and hard-to-find parts
- Faster global delivery via FedEx / DHL / UPS
- Easier access to rare and high-value models
- Flexible sourcing for individual parts or complete solutions
- Lower MOQs and more adaptable buying options
- Multi-brand procurement in one order
- OEM replacement and alternative model solutions available
- Fewer intermediaries, ensuring more competitive pricing
Why Global Buyers Choose O&Kmarts
- Limited to fast-moving SKUs only
- Limited local market availability
- Inventory frequently fails to meet urgent demand
- Long replenishment cycles, often taking weeks
- Rarely stock high-value compressors (e.g. Copeland YHV119)
- Frequently require bundled purchases
- Rigid and difficult MOQ negotiations
- Limited brand selection
- Minimal or no customization capability
- Higher local distribution and markup costs
Top Questions from OKmarts Buyers
Q: Does OKmarts maintain a historical record of my purchases for future asset management or auditing?
A: Yes. Your corporate dashboard retains a permanent, secure repository of all past transactions, technical specifications, commercial invoices, and warranty dates. This allows your maintenance, repair, and operations (MRO) teams to instantly pull historical records for equipment auditing or one-click reordering of consumable parts.
Q: How does OKmarts handle unexpected price fluctuations or tariff updates after an order is placed?
A: Once a Proforma Invoice is issued and payment is confirmed, your pricing is legally locked. OKmarts absorbs any subsequent raw material price spikes, supplier price adjustments, or sudden export tariff increases, guaranteeing that the price you pay at checkout is final.
Q: Are software licenses, firmware updates, and configuration files included with hardware like HMIs and PLCs?
A: Hardware units ship with standard factory-default firmware. For proprietary programming software or specific firmware flashes required for legacy system compatibility, buyers must consult our technical support team during procurement to confirm licensing terms.
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Q&A
Q: How can I request returns or refunds?
A: If you need to return or request a refund, you can submit a return or refund request on the order page and follow the platform's return policy. We will process your request as soon as possible and ensure that your rights are protected.
Q: How can I filter products by price range?
A: On the product list page, you can use the price filter to set your desired price range. The system will display products that meet your criteria, helping you find suitable items quickly.
Q: How can I change my email address associated with my account?
A: To change the email address associated with your account, please contact our customer service team and provide them with the necessary verification information. They will assist you in updating your email address.







