RCM Flow Meter Flow Rates

 Standard Flow Rates

Series 7000 (threaded) & 8000 (wafer)
Size		Liquid		Gas (option I)		Steam
in	mm	GPM	l/m	SCFM	Nm³/h	#/h
¼	08	2	8	10	15	40
¼	08	3	15	20	30	60
¼	08	4	25	30	50	80
½	15	2	8	10	15	40
½	15	3	10	20	30	60
½	15	4	15	30	50	80
½	15	6	25	40	80	120
½	15	10	40	60	100	200
¾	20	6	25	60	100	120
¾	20	10	40	100	150	200
¾	20	15	60	150	200	300
¾	20	20	80	200	300	400
1	25	15	60	150	250	300
1	25	20	80	200	400	400
1	25	30	120	300	500	600
1	25	40	150	400	600	800
1-½	40	30	120	300	500	600
1-½	40	40	150	400	600	800
1-½	40	60	240	600	1000	1000
1-½	40	100	400	800	1200	2000
2	50	40	150	400	600	800
2	50	60	240	600	1000	1000
2	50	100	400	800	1200	2000
2	50	150	600	1000	1500	3000
2	50	200	800	1200	2000	4000
3	80	200	800	1000	1500	4000
3	80	300	1000	2000	3000	6000
3	80	400	1500	3000	5000	8000
3	80	500	2000	4000	6000	10000
Series 8000 only (wafer)
Size		Liquid		Gas (option I)		Steam
in	mm	GPM	l/m	SCFM	Nm³/h	#/h
2-½	65	60	240	600	1000	1000
2-½	65	100	400	800	1200	2000
2-½	65	150	600	1000	1500	3000
2-½	65	200	800	1200	2000	4000
4	100	300	1000	1500	50	6000
4	100	400	1500	3000	100	8000
4	100	600	2400	5000	150	10000
4	100	800	3000	6000	200	15000
5	125	300	1000	1500	50	6000
5	125	400	1500	3000	100	8000
5	125	600	2400	5000	150	10000
5	125	800	3000	6000	200	15000
6	150	600	2400	3000	100	10000
6	150	800	3000	5000	150	15000
6	150	1000	4000	8000	250	20000
6	150	2000	8000	15000	400	40000
8	200	600	2400	5000	150	10000
8	200	1000	4000	8000	250	20000
8	200	2000	8000	15000	400	40000
8	200	3000	12000	20000	600	60000

Optional Flow Rates

Optional Low Flow Rates (option ES)
Size		Liquid			Gas		Steam
in	mm	GPH	l/h	cc/m	SCFH	Nm³/h	Pounds per Hour
½	15	4	15	200	40	1	0.3 – 2 #/HR
½	15	6	20	300	60	2	0.4 – 3 #/HR
½	15	10	40	400	100	3	0.5 – 4 #/HR
½	15	15	60	600	150	4	0.5 – 6 #/HR
½	15	20	80	1000	200	6	1 – 8 #/HR
½	15	30	120	2000	300	8	1.5 – 10 #/HR
½	15	40	150	3000	400	10	2 – 15 #/HR
½	15	60	240	4000
½	15	100	400	400

Non-Standard Flow Rates

** Other flow rates are available upon request with a minimum flow rate of 2 GPM or 10 SCFM and a maximum flow rate no greater than the maximum for the given size in the above table . Confirm availability and pricing with the factory.

Lower flow rates are available in the 1/2″ body only.

RCM Flow Meters offer a 6:1 Turndow

A 6:1 turndown (also called rangeability) for a differential pressure (DP) flow meter refers to the usable measurement range over which the meter can accurately measure flow.

It means the meter can handle a maximum flow rate that is 6 times the minimum flow rate while staying within its specified accuracy (typically ±0.5% to ±1% or better, depending on the device and calibration).

Simple Example

• If the maximum (full-scale) flow is 600 gallons per minute (GPM), a 6:1 turndown allows accurate measurement down to 100 GPM (600 ÷ 6).
• Below that minimum (e.g., 80 GPM), accuracy degrades significantly.

Turndown ratio = Maximum accurate flow ÷ Minimum accurate flow.

DP flow meters (orifice plate, venturi, flow nozzle, etc.) work on the Bernoulli principle: Flow rate is proportional to the square root of the measured differential pressure (ΔP).

• Flow (Q) ∝ √ΔP
• If flow drops to 1/6 of maximum, ΔP drops to (1/6)² = 1/36 of maximum.

Dials & Scales:

Range		Smallest	Range		Smallest
Max	Min	Increment	Max	Min	Increment
1	0.15	0.01	100	15	1
2	0.30	0.05	120	15	1
3	0.40	0.05	150	20	2
4	0.50	0.10	200	30	2
6	0.50	0.10	240	30	2
8	1.0	0.10	250	30	5
10	1.5	0.10	300	40	5
15	2.0	0.20	400	50	10
20	3.0	0.50	600	50	10
25	3.0	0.50	800	100	10
30	4.0	0.50	1000	150	10
40	5.0	1.0	1500	200	20
50	6.0	1.0	2000	300	20
60	5.0	1.0	3000	400	50
80	10.0	1.0	4000	500	100