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Extreme Temperature Fluid Flow Meter: Cryogenic and Superheated Processing Probes
Quick Answer: Flow meters for cryogenic fluids (down to -196°C) and superheated media (up to 400°C) need welded probe assemblies, integrated PT100 temperature sensors, and material grades like 316L or Hastelloy. Silver Instruments supplies inline and insertion probes with 4-20 mA HART output, ATEX zone 1 certification, and full material traceability. Send us your fluid name, temperature range, pipe size (DN), and flow rate for a specific selection.
Why Standard Flow Meters Fail at the Extremes
Most industrial flow meters are designed for water at 20°C or mild process streams. Push them into liquefied natural gas service at -162°C and the body material can turn brittle within hours. Subject an ordinary vortex shedder to 350°C superheated steam and thermal expansion shifts the sensor gap, destroying accuracy. Here is the thing: cryogenic fluids also boil off rapidly. This causes two-phase flow that confuses velocity-based meters. In practice, you need a flow measuring probe that is vacuum rated, cold shank insulated, and mechanically decoupled from pipe stress.
Because superheated processing in chemical plants or food oil fryers often runs above 300°C, the probe electronics must sit in a thermal isolation housing. Most engineers skip the fact that standard PTFE cable jackets degrade fast in hot oil vapor. We have seen this on customer sites many times: a flow meter works for a week, then the signal drifts because the cable insulation has softened. The fix is metal-sheathed cable, a liquid-filled thermal barrier, or a remote transmitter rated to 85°C ambient.
Cryogenic Probes You Can Trust Down to -196°C
A paint manufacturer in Thailand asked us last year for a liquid nitrogen dosing meter. They batch small volumes into a reactor, DN10 piping, flow range 20 to 200 kg/h. Standard Coriolis meters with split housings would ice up and cause zero drift. Silver Instruments supplied an all-welded single straight tube Coriolis sensor (SCM-DN10), with a double-wall vacuum jacket on the probe section. The meter body is 316L, polished to Ra 0.8 µm, and each unit came with an individual cryogenic factory calibration from -170°C to +40°C using liquid nitrogen as the test medium. The output is 4-20 mA HART plus a pulse for totalizing. We paired it with a remote flow transmitter mounted 5 metres away, outside the cold zone.
For LNG bunkering in Vietnam, we often recommend a vortex flow meter with an integral temperature probe. The SVY series in DN50/DN80 has a non-ported all-welded sensor that prevents ice buildup behind the shedding bar. The integrated Class A PT100 measures the fluid temperature instantly so the meter calculates density corrected mass flow of LNG in kg/min. The wetted parts are 316L with EN 10204 3.1 material certificates. Inlet straight run is only 10D because the bluff body design compensates for small upstream bends. This matters on a compact skid.
Superheated Steam and Thermal Oil Probes
Superheated steam at 40 bar, 380°C carries a lot of energy. If you measure it for boiler efficiency or internal billing in a textile plant, you need a flow probe that tolerates rapid temperature shocks. We offer an insertion thermal mass flow meter with a ceramic-insulated sensor and a Hastelloy C-22 sheath. With this model, the probe inserts through a 1.5 inch ball valve into a DN200 main steam line. The transmitter electronics are in a separate die-cast aluminium head with a high-temperature graphite gasket. The 4-20 mA output is linearised for steam mass flow up to 50 t/h. We have a customer in Muscat, Oman who replaced six old differential pressure orifice plates with two of these insertion probes in 2022. Their maintenance man-hours dropped by 80% because there are no impulse lines to clean.
For thermal oil circulation in a Malaysian plywood press, we installed an oval gear flow meter with a PPS gear set and HT bearing, but we added a custom probe thermowell in the meter body. The PT100 inside that thermowell feeds a local indicator. The meter handles 2 to 20 cubic metres per hour at 280°C, thermal oil D12, viscosity around 0.5 cP at that temperature. The trick is that the oval gear me
Key Hardware Details That Make a Difference
Across all extreme temperature probes, we specify a few things that you will want to ask any supplier about. First, the stem seal: it should be all metal, no O-ring, unless the O-ring is Kalrez and the temperature is below 300°C. Second, the neck length: for cryogenic service, a 150 mm cold neck with a vacuum barrier stops the housing from icing. Third, the transmitter: remote mount is better, with a low thermal mass bracket. We use the same universal transmitter board, 4-20 mA HART, with local LCD and four push buttons, and it works from -40°C to 75°C ambient. Explosion proof: ATEX II 2G Ex d IIC T6 for gas, suitable for Zone 1. This covers hydrogen as well, which appears in chemical processing. Wet part materials: you can choose 316L, Hastelloy C-276, Duplex 2205. Last, process connection: from ½ inch NPT for tiny probes up to DN50 flange PN40 / ANSI 300 for heavy process piping.
How to Choose the Right Type of Flow Meter
In low-temperature liquid service where mass accuracy matters, direct mass meters (Coriolis) give the best data. We output kg/h, density, and temperature from one device. For large steam pipes where inline meters are too expensive, insertion vortex or thermal probes do the job. For hot oil custody transfer, positive displacement meters like oval gear with high-temperature clearances work very well if the oil is filtered. Silver Automation Instruments builds all three types, so we do not push one technology. We listen to your pipe diameter, fluid phase, pressure drop budget, and required accuracy, then propose a meter with the matching probe design.
Rapid Ordering Process
You do not need to fill long forms. Just tell us: fluid name, minimum and maximum temperature in °C, line pressure in bar, pipe inner diameter or DN, and your flow range (min, normal, max). With these five data points we can confirm a probe material and a model number within half a day. Contact us by Tel: +86-135-1213-1526, WhatsApp: 86-135-12131526, or WeChat: +86 13512131526. We ship ex-works Nanjing, China to over 45 countries, including Indonesia, Brazil, and Saudi Arabia, with full shipping documents and calibration reports.
Frequently Asked Questions
Can these flow meters handle liquid nitrogen and LNG at the same time?
Yes, a Coriolis meter with an all-welded duplex steel body measures both fluids if you re-scale the 4-20 mA output to the new density. The probe resists thermal shock when switching from LNG at -162°C to liquid nitrogen at -196°C. We factory test with LN2 as standard.
What is the highest steam temperature your insertion probes support?
Our standard thermal mass probe handles steam up to 400°C and 64 bar. With a custom ceramic-insulated sensor and extended neck, we have tested to 450°C for short-term superheat excursions. Tell us your maximum and hold time, and we will specify the right alloy.
Are the probes removable under pressure for servicing?
Insertion probes come with a ball valve and retractor assembly for hot-tap installation and removal up to 20 bar. The operator must follow a safe hot-tap procedure and wear protective gear. For cryogenic service, removal under pressure is not recommended due to boil-off risk; we advise a double-block-and-bleed setup.
Do these flow meters need external temperature compensation?
No. Each probe includes an integrated PT100 Class A sensor. The transmitter reads the temperature and automatically compensates density, mass flow, or viscosity in real time. You get one cable with 4-20 mA HART loop and all variables accessible via a HART handheld communicator.
How fast can I get a cryogenic flow meter quotation?
Send your fluid, temperature in °C, pipe size DN, and flow range to our WhatsApp 86-135-12131526. We typically reply with a compliance statement and price in USD or EUR within 4 hours during Asia business time. Longer response outside that window, but we never exceed 24 hours.
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