F56 Metal Tube Variable Area Flowmeter

The F56 metal rotameter is built with an all-metal tube, keeping readings accurate in extreme heat, pressure, or corrosive chemicals where glass and plastic won't hold up. Built to order — your choice of wetted material, connection, and indicator — with a scale calibrated to your exact fluid, so it fits your process precisely.

Nominal size:	DN15–DN250 (1/2"–10")
Media:	Liquid, gas, steam
Wetted materials:	304/316/317 SS, PTFE-lined,
	Hastelloy, Ti, Zr, PP, PV, Al, Cu
Measuring range:	10–300,000 L/h (water)
	0.7–3,000 Nm³/h (air)
Turndown ratio:	10:1
Accuracy:	1.0 / 1.5 / 2.0 / 2.5 (% F.S.)
Max pressure:	Up to 42 MPa (size-dependent)
Fluid Temp:	Standard: -80~300°C
	High-temp option: up to 400°C
Enclosure rating:	IP67
Output:	Local needle or LCD
	4-20mA / HART (remote models)
Explosion-proof:	Ex ia IIC T4/T5/T6 Ga · Ex d IIC T6 Gb

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Metal Rotameter

A rotameter measures flow by how high a float rises inside a tapered tube — the higher it rises, the more flow is passing through. The F56 uses a metal tube instead of plastic or glass, built for higher pressure, higher temperature, and harsher conditions. A permanent magnet embedded in the float lets the indicator read its position straight through the metal wall, driving the needle on the dial and, on digital models, updating the LCD with instantaneous and total flow

Rated accuracy you can count on

The F56 comes in four accuracy grades — 1.0, 1.5, 2.0, or 2.5 . Which checks the meter's error at 10 points across the scale, from 10% up to 100% of full flow, not just at one reading. That matters because accuracy on a rotameter is stated as a percentage of the meter's full-scale range, not of whatever it happens to be reading — so the same meter is more accurate near the top of its range than near the bottom. We'll help you pick a scale where your everyday flow sits comfortably in the upper half, so you get the accuracy you paid for in daily use — not just at maximum flow.

Built for extreme heat and pressure

Whether your line runs near-freezing utility water or scalding process fluid, there's an F56 built for it. Standard models cover a wide temperature range as-is, and an optional high-temperature configuration extends that up to 400°C for direct steam service. Pressure ratings scale with pipe size too, holding firm even at the high-pressure end where a lighter-built flowmeter would give out. Exact ratings for your size, material, and indicator type are in the Specs tab.

Materials Matched to Your Process

Every F56 shares the same measuring principle — what changes is what touches your fluid. Pick the wetted material based on what's actually flowing through the line:

Stainless steel

304 and 316 cover most installations — 316 adds resistance to chlorides and mild acids. Low-carbon "L" grades resist weld-seam corrosion, the standard for food, beverage, and pharma lines.

PTFE lining

A fully inert lining protects against strong acids and alkalis that would attack bare stainless steel — for aggressive chemical service.

Hastelloy, titanium & zirconium

For hot acids, caustic soda, seawater, and the most aggressive chemical service — where even 316 stainless would corrode.

PP & PV

A lighter, lower-cost build for mild-duty utility water or dilute chemical dosing at ambient temperature (vertical mounting, up to DN100).

Choose the Connection that Fits Your Line

Two connection options available:

Flange connection is the standard choice for permanent, high-pressure process piping.
Tri-clamp sanitary connection lets the meter come apart for cleaning in seconds, no bolts involved. Suitable where hygiene and quick disassembly matter more such as food, beverage, and pharma lines.

Mount it however your piping runs

Not every installation has room for a straight vertical run, so the F56 mounts five different ways — vertical, horizontal, and three side/bottom-entry variants for tight spaces. Whichever orientation fits your existing layout, the same measuring tube and indicator options apply.

Calibrated to your fluid, not just water

Look closely at the dial and you'll see three small lines under the digital display — the density, temperature, and pressure the printed scale was actually calibrated against. A float rides differently in a light gas than in a dense liquid, so we compute each meter's scale from your real operating fluid — not a generic water or air reference — so the numbers on the dial match what you're actually measuring, right out of the box.

Choose How You Read the Flow

Every F56 measures the same flow on the same tube — what changes is how you want to see it: a local needle only, a two-wire signal to your control system, or a battery-powered display, each suited to a different job site.

Simple local reading — P8

No wiring, no power. A polished stainless dial and mechanical needle give you a clear flow reading right on the pipe — ideal for sanitary areas or anywhere you just need to see the flow.

Tie it into your control system — P10

Keeps the local needle and adds an LCD plus a loop-powered 4-20mA/HART output, so flow reaches your DCS or PLC over two wires. Available intrinsically safe or flameproof, with optional alarm switches.

Hazardous-area ready — P10I

A flameproof local needle display for sites that need Ex-rated protection without a remote signal. Add a switch and it can also trip a flow alarm at the meter.

F56 P10B battery-powered indicator with LCD

No power line? No problem — P10B

Runs on a single lithium battery for about a year, and still gives a full LCD readout of flow and totals — wherever the installation happens to be.

Specifications

Specification		Value
Applicable Fluid		Liquid, gas, steam
Measuring range*	Water	10–300,000 L/h
Measuring range*	Air	0.7–3,000 Nm³/h
Turndown ratio		10:1
Accuracy class**		1.0, 1.5, 2.0, 2.5
Media temperature***	P8	-80°C to +300°C (PTFE lining: 0–80°C)
Media temperature***	P10, P10B, P10I	-40°C to +120°C (PTFE lining: 0–80°C)
Ambient temperature	P8	-40°C to +120°C
Ambient temperature	P10, P10B, P10I	-20°C to +60°C
Media viscosity (excl. F56/SP)	DN15	<1 mPa·s (F15.00–F15.03) <5 mPa·s (F15.04–F15.30)
	DN25	<20 mPa·s
	DN50–DN250	<30 mPa·s
Nominal pressure	DN15–DN50	4.0 MPa (max: DN15/DN25 42 MPa, DN50 32 MPa)
Nominal pressure	DN80–DN250	1.6 MPa (max: DN80 10 MPa, DN100 6.4 MPa, DN125/DN150 4.0 MPa, DN200/DN250 2.5 MPa)
Process connection	Flange	DIN2501 / ANSI / JIS (DIN recommended)
Process connection	Also available	Tri-clamp (sanitary), threaded, compression fitting
Electrical connection		M20×1.5, 1/2"G, 1/2"NPT, 3/4"G, 3/4"NPT
Mounting orientations		Vertical, horizontal, top-in bottom-out (vertical lines), bottom-in side-out, side-in side-out
Straight pipe run	Inlet	≥5×DN
Straight pipe run	Outlet	≥250 mm
Enclosure rating		IP67
Explosion-proof rating	Intrinsically safe	Ex ia IIC T4/T5/T6 Ga
	Flameproof	Ex d IIC T6 Gb
	Certificate	CE16.1206X
Intrinsic safety parameters	Meter side	Ui = 28V Ii = 93mA Pi = 0.65W Ci ≤ 5nF Li = 0mH
Intrinsic safety parameters	Required barrier	Uo ≤ 28V Io ≤ 93mA Po ≤ 0.65W Co ≥ Ci + Ccable Lo ≥ Li + Lcable
Output signal		2-wire (4-20)mA / HART protocol

* Measuring range shown at reference conditions: clean water at 20°C, air at 20°C / 0.1013MPa absolute; special ranges available on request.
** Accuracy class is verified per the German VDI/VDE 3513 standard at 10 points across the scale (10%–100% of full flow). Since accuracy is stated as % of full-scale reading, real-world accuracy is best when normal operating flow sits in the upper half of the selected range.
*** A high-temperature option (H1/H2/H3 order codes) extends media temperature up to 400°C on any indicator type — specify at order time.

Vertical Mounting

Unit: mm

DN	H	L	L1
DN15	250	156	75
DN20	250	162	80
DN25	250	165	84
DN32	250	171	90
DN40	250	177	95
DN50	250	180	98
DN65	250	187	106
DN80	250	194	112
DN100	250	203	122
DN125	400	213	131
DN150	400	225	145
DN200	450	245	170
DN250	450	253	183

Side-In / Side-Out Mounting

Unit: mm

DN	H	H1	B
DN15	200	500	100
DN20	200	500	100
DN25	200	500	100
DN32	200	500	100
DN40	250	600	120
DN50	250	600	120
DN65	350	700	160
DN80	350	700	160
DN100	350	750	180
DN125	400	800	250
DN150	450	850	250

Bottom-In / Side-Out Mounting

Unit: mm

DN	H	H1	B
DN15	200	500	100
DN20	200	500	100
DN25	200	500	100
DN32	200	500	100
DN40	250	600	120
DN50	250	600	120
DN65	350	700	160
DN80	350	700	160
DN100	350	750	180
DN125	400	800	250
DN150	450	850	250

Horizontal Mounting

Unit: mm

DN	H	H1
DN15	200	255
DN20	200	255
DN25	200	255
DN32	250	250
DN40	250	245
DN50	250	245
DN65	300	255
DN80	350	270
DN100	350	280
DN125	400	415
DN150	450	440
DN200	500	520

P8 Local Indicator — Standard Dimensions

Unit: mm

DN	H	L	L1
DN15	250	87	69
DN20	250	93	74
DN25	250	96	78
DN32	250	102	84
DN40	250	108	89
DN50	250	111	92
DN65	250	118	100
DN80	250	122	107
DN100	250	128	116
DN125	400	133	126
DN150	400	139	140
DN200	450	150	165
DN250	450	155	178

Flange Bolt Pattern (ANSI B16.5 / DIN2501)

Size (ANSI B16.5, 150lb)	D	k	b	d3	f	n	d2
1/2"	88.9	60.5	11.2	35.1	1.6	4	15.7
3/4"	98.6	69.9	12.7	42.9	1.6	4	15.7
1"	108.0	79.2	14.2	50.8	1.6	4	15.7
1-1/4"	117.3	88.9	15.7	63.5	1.6	4	15.7
1-1/2"	127.0	98.6	17.5	73.2	1.6	4	15.7
2"	152.4	120.7	19.1	91.9	1.6	4	19.1
2-1/2"	177.8	139.7	22.4	104.6	1.6	4	19.1
3"	190.5	152.4	23.9	127.0	1.6	4	19.1
4"	228.6	190.5	23.9	157.2	1.6	8	19.1
5"	254.0	215.9	23.9	185.7	1.6	8	22.4
6"	279.4	241.3	25.4	215.9	1.6	8	22.4
8"	342.9	298.5	28.4	269.7	1.6	8	22.4
10"	428.4	362.0	30.2	323.9	1.6	12	25.4

DN / PN (DIN2501)	D	k	b	d3	f	n	d2
15/4.0	95	65	16	45	2	4	14
20/4.0	105	75	16	55	2	4	14
25/4.0	115	85	18	68	2	4	14
32/4.0	140	100	18	76	2	4	18
40/4.0	150	110	18	86	2	4	18
50/4.0	165	125	20	102	3	4	18
65/1.6	185	145	18	120	3	4	18
80/1.6	200	160	20	138	3	8	18
100/1.6	220	180	20	162	3	8	18
125/1.6	250	210	22	188	3	8	18
150/1.6	285	240	22	218	3	8	22
200/1.6	340	295	24	268	3	12	22
250/1.6	405	355	26	325	3	12	26

Tri-Clamp / Sanitary Connection

Unit: mm

DN	D	P	L	L1
DN15	34.0	27.5	156	75
DN20	34.0	27.5	162	80
DN25	50.5	43.5	165	84
DN32	50.5	43.5	171	90
DN40	50.5	43.5	177	95
DN50	64.0	56.5	180	98
DN65	91.0	83.5	187	106
DN80	106.0	97.0	194	112
DN100	119.0	110.0	203	122

F56 flowmeters are put to work across oil & gas, chemical, metallurgy, power, food & pharmaceutical, and pulp & paper processes — measuring and controlling liquid, gas, and steam flow wherever the line demands.

How to Order — F56 Metal Rotameter

Work through the 10 steps below. Steps 1–5 help you confirm the right pipe size, range and accuracy before you spec the instrument — steps 6–9 build your order code automatically as you go.

Steps 1–3 are optional sizing helpers — use them to sanity-check your pipe size and flow range (step 4). Skip them if you already know your DN.
Steps 6–9 build the order code below. Optional add-ons default to "None" — leave them if not needed.
Copy the code and size/flow details below and include them when you request a quote.

Not sure which material or range fits your process? Contact our sales team — we're happy to confirm before you order.

1–5. Sizing (optional)Helps confirm your pipe size, range & accuracy

1Fluid Type

Liquid

2Pipe Size (DN)

DN250

Standard range for DN250 (CrNiSteel): 220000–300000 L/h (reference: water/air at standard conditions).

3Flow ConditionsYour normal (typical) flow

4Recommended Range

✓ DN250 (CrNiSteel) covers 220000–300000 L/h (reference: water/air at standard conditions). Your flow is about 83% of full scale; sales can confirm the closest standard float, ideally 40–80% of range.

5Accuracy GradeLower number = tighter tolerance

— Select accuracy grade —

1.0

1.5

2.0

2.5

1.0

1.5

2.0

2.5

6. Wetted Material

6Material Selection(Others available, contact sales)

— Select material —

304SS

316SS

304LSS

316LSS

317SS

317LSS

PTFE-Lined (1Cr18Ni9Ti body)

Hastelloy C276

Hastelloy B2

Hastelloy B1

Pure Nickel N6

PV — vertical mounting only, max DN100

PP — vertical mounting only, max DN100

Titanium

Zirconium

Aluminum — float only, not full wetted body

Copper — float only, not full wetted body

6bTube Add-OnOptional

— Select tube add-on —

None

T — Insulation / cooling jacket

7. Connection Type

7Connection Type

— Select connection type —

Flange

Threaded

Tri-Clamp / Sanitary

Compression Fitting

Flange

Threaded(photo pending)

Tri-Clamp / Sanitary

Compression Fitting(photo pending)

Flange standard (DIN2501 / ANSI B16.5 / JIS) and pressure class are confirmed with sales at quote time.

8. Display / Output

8Indicator

— Select indicator —

P8 — Local indicator (stainless, polished, sanitary)

P10-A — Remote output, (4-20)mA

P10-H — Remote output, (4-20)mA + HART

P10-B — Local indicator, 3.6V battery, instantaneous + totalized

8bIndicator Add-OnOptional — KG22 or KG24

— Select indicator add-on —

None

KG22 — Low-limit (K1)

KG22 — High-limit (K2)

KG24 — Low-limit (KE1)

KG24 — High-limit (KE2)

8cHigh-Temperature TypeOptional

— Select high-temperature type —

None

H1 — 120–160°C

H2 — 160–250°C

H3 — 250–400°C

9. Installation / Mounting

9Mounting Type

— Select mounting type —

Vertical

Horizontal

Bottom-In / Side-Out

Side-In / Side-Out

Top-In / Bottom-Out (vertical lines)

Vertical

Horizontal

Bottom-In / Side-Out

Side-In / Side-Out

Top-In / Bottom-Out

10. Your Order Code

Base model: F56 / — / — / — / — / L

Add-ons: Tube: None / Indicator: None / High-temp: None

Size, flow & accuracy: DN: DN250 / Normal flow: 250000 L/h (liquid) / Accuracy: —

— Vertical mounting (PI) is conventionally omitted from LORRIC's published catalog codes; it's shown here for clarity while configuring.
— Indicator add-on (KG22/KG24) pairs with P10-A and P10-H — confirm with sales before ordering.
— Recommended ranges (step 4) use standard reference conditions (water at 20°C for liquids; air at 20°C, 0.1013MPa abs for gases). Other liquids/gases, and all steam duties, are converted and confirmed by our engineering team.
— This tool helps you assemble a specification to send us — final availability and pricing are confirmed by our sales team.

What Your Order Code Means

Build a full F56 order code by combining one code from each category below.

Category	Code	Description
Mounting form	PI	Vertical
	HI	Horizontal
	BO	Bottom-in, side-out
	SO	Side-in, side-out
	UP	Top-in, bottom-out (vertical lines)
Connection type	F	Flange
	W	Threaded
	H	Tri-clamp / sanitary
	C	Compression fitting
Wetted material (others available)	S4	304SS
	S6	316SS
	S4L / S6L	304LSS, 316LSS
	S7 / S7L	317SS, 317LSS
	C276, B2, B1, N6	Hastelloy C276 / B2 / B1, pure nickel N6
	PV	PV (vertical only, max DN100, ambient service)
	PP	PP (vertical only, max DN100)
	Ti	Titanium alloy
	Zr	Zirconium alloy
	Al	Aluminum alloy
	Cu	Copper alloy
	SP	1Cr18Ni9Ti with PTFE lining
Indicator	P8	Local indicator; stainless steel stamped, polished/brushed finish, sanitary type
	P10-A	Remote output: (4-20)mA — KG22/KG24 optional
	P10-H	Remote output: (4-20)mA + HART protocol — KG22/KG24 optional
	P10-B	Local indicator: 3.6V lithium battery-powered, displays instantaneous + totalized flow
Measuring medium	L	Liquid
Measuring medium	G	Gas (also used for steam)
Tube add-on (optional)	T	Insulation / cooling jacket
Indicator add-on (optional)	KG22-K1	Low-limit alarm
	KG22-K2	High-limit alarm
	KG24-KE1	Low-limit alarm
	KG24-KE2	High-limit alarm
High-temperature type (optional)	H1	Media temperature: 120–160°C
	H2	Media temperature: 160–250°C
	H3	Media temperature: 250–400°C

Example

F56 / F / S4 / P10H / L

Vertical mounting (PI — omitted from the code)
F — Flange connection
S4 — 304SS wetted material
P10H — Remote output, (4-20)mA with HART
L — Liquid media

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