Watlow Electric Freeflex 1-800-WATLOW2• www.watlow.com • info@watlow.com, W/m, W/ft, China, Italy, Japan, Korea, Spain, France, Mexico, Sweden, Taiwan, Voltage, Germany, Watts/ft

Quote and Ordering Information			Tube Flexing
For a quote, please request, fill out and return a FREEFLEX			• Static (to route around components in system)
			• Dynamic (subject to more continuous flexing)
application data sheet.			• Occasional, frequent or continuous
To order, please specify:			Note: Minimum recommended flexing radius
Fluid Type			• 1⁄32 in. (0.792 mm) I.D. x 1⁄16 in. (1.59 mm) O.D. Teflon® 1 in. (25 mm)
Inlet Temperature			• 1⁄16 in. (1.59 mm) I.D. x 1⁄8 in. (3.18 mm) O.D. Teflon®	11⁄2 in. (38 mm)
Outlet Temperature			• 1⁄8 in. (3.18 mm) I.D. x 3⁄16 in. (4.76 mm) O.D. Teflon®	2 in. (51 mm)
Flow Rate			• 3⁄16 in. (4.76 mm) I.D. x 1⁄4 in. (6.35 mm) O.D. Teflon®	3 in. (76 mm)
Voltage - Typically less than 36 volts			Heater Leads
			• One at each end
Watts/ft - See chart below for typical values
			• Both at one end
Maximum Allowable Outside Surface Temperature
			• Standard lead insulation (UL® Style 1180 white Teflon®)
Tube Size
			• Other insulation (specify)
• 1⁄32 in. (0.792 mm) I.D. x 1⁄16 in. (1.59 mm) O.D.
• 1⁄16 in. (1.59 mm) I.D. x 1⁄8 in. (3.18 mm) O.D.			Heater Lead Length
1	3	⁄16 in. (4.76 mm) O.D.	• Standard 12 in. (305 mm) w/customer end stripped/tinned
• ⁄8 in. (3.18 mm) I.D. x			1
• 3⁄16 in. (4.76 mm) I.D. x 1⁄4 in. (6.35 mm) O.D.			⁄2 in. (13 mm)
• Other (specify size)			• Other (specify)
			Heater Lead Exit Direction
Tube Material
			• Inboard/outboard
• Teflon® (standard)
			Temperature Sensor
• Silicone rubber
			• Standard thermocouple (#30 AWG Teflon® - Type J)
• Others upon request			• Thermistor (specify) 10K￿ at 25˚C (72˚F) standard
Tube Length - 12 to 120 in. (305 to 3048 mm) typical
			• Other temperature sensors size/types (specify)
• Total
			• Sense heater element or tube temperature
• Heated
			Sensor Lead Exit Direction
• Unheated (specify)
			• Inboard/outboard
Tube Fittings
			Temperature Sensor Lead Length
• No fittings (1 in. (25 mm) bare tubing at each end)			• Standard 12 in. (305 mm)
• Other (specify)			• Other (specify)

Water Temperature Rise/Length Versus Flow Rate Versus Watt Density

Temperature Rise	(˚F/Foot)
Water

Water Temperature Rise/Foot vs. Flow Rate vs. Watt Density (1/16 in. (1.59 mm) I.D. Tube)

90

80

70

60							W/ft	W/m
50
							50.0	164
40							37.5	123
30							25.0	82
							12.5	41
20
10
0
10	20	30	40	50	60	70	80	90
			Flow Rate of Water (mL/Minute)

164
146		Water
128
109	(˚C/Meter)	Temperature
55
91
73
36		Rise
18
0
100

Water Temperature Rise °F/Foot

	Flow Rate (mL/minute)
W/ft	10	30	50	100
50.0	82	29	19	10
37.5	64	22	14	7
25.0	41	16	10	5
12.5	22	8	5	3
Water Temperature Rise °C/Meter
	Flow Rate (mL/minute)
W/m	10	30	50	100
164	149	52	35	18
123	116	40	26	13
82	75	29	18	9
41	40	15	9	5

FREEFLEX Outside Diameter Temperature Versus Watts/Length

O.D. Temperature vs. Watts/Meter

O.D. Temperature (˚F)

350	1.5	3.0	4.6		6.1	7.6		177
300
								149
250									.D.O
								121
200								93	Temperature
150
								66
			O.D. Temperature vs. Watts/Unit Length						(˚C)
100				Dry Tube - No Flow
								38
50
								10
0
	5
0		10	15		20	25	30

O.D. Temperature vs. Watts/Foot

W/ft W/m		O.D. Temperature
		°C	(°F) (Ambient)
0	0	21	(70)
5	1.5	60	(140)
10	3.0	99	(210)
15	4.6	129	(265)
20	6.1	154	(310)
25	7.6	171	(340)

To be automatically connected to the nearest North American Technical and Sales Office:

1-800-WATLOW2 • www.watlow.com • info@watlow.com

International Technical and Sales Offices: Australia, +61-3-9335-6449 • China, +86-21-3950-9510 • France, +33 (0) 3073-2425 • Germany, +49 (0) 7253-9400-0 • Italy, +39 (0) 2 458-8841 • Japan, +81-3-3518-6630 • Korea, +82-2-575-9804 • Malaysia, +60-3-7980-7741 • Mexico, +52 (442) 217-6235 • Shanghai, +86-21-3950-9504 • Singapore, +65-6777-1266 • Spain, +34 91 675 1292 • Sweden, +46 35-27-11-66 • Taiwan, +886-7-288-5168 • United Kingdom, +44 (0) 115-964-0777