Kele Probe Calculator V2 2019

	A	B	C	D	E	F	G	H	I	J	K
1	Kele probe formulae	presently the table is for round ducts only
2	NOTE:	Probe must EXACTLY MATCH the duct cross section and seal when it is inserted
3			Great deals on Kele pobes at:	TruTechTools	<- click link
4	METHOD A
5	DIFF PRESSURE MEAS		INPUT INCHES OF WATER COLUMN READING IN THE YELLOW BOX
6	Delta P from probe: INPUT	0.2029	inches water column	48.7	Pa	<- Conversion
7
8		4" Probe	5" Probe	6" Probe	7" Probe	8" Probe	10" Probe	12" Probe	14" Probe	16" Probe	18" Probe
9	CFM Round duct	87	143	212	295	390	612	884	1216	1604	2030
10		CFM in a ROUND DUCT is displayed in the green box above, a different value for each probe length.
11
12	METHOD B
13	FOR HIGH/LOW PRESSURE MEAS		INPUT INCHES OF WATER COLUMN READING IN THE 2 PINK BOXES
14	High Pressure input	0.5704		Low Pressure input	0.5586
15	Delta P calculated from hi/lo	0.0118	inches water column	2.9	Pa	<- Conversion
16
17		4" Probe	5" Probe	6" Probe	7" Probe	8" Probe	10" Probe	12" Probe	14" Probe	16" Probe	18" Probe
18	CFM Round duct	21	34	51	71	94	148	213	293	387	489
19		CFM in a ROUND DUCT is displayed in the green box above, a different value for each probe length.
20
21	Accuracy examples on a 100 CFM nominal airflow:
22	Using a TEC DG1000, RETROTEC DM32 (or equiv) with accuracy of +/- 0.25 Pa			Using a testo 510 with accuracy of +/- 3 Pa
23	Accuracy on a 4" round duct is +/- 6 CFM			Accuracy on a 4" round duct is +/- 21 CFM
24
25	CAUTION: NERD ZONE BELOW!
26	Intermediate values in the METHOD A formula
27	Kv	2225	2325	2400	2450	2480	2490	2500	2525	2550	2550
28	Velocity in FPM	1002	1047	1081	1104	1117	1122	1126	1137	1149	1149
29	Diameter of round duct (in.)	4	5	6	7	8	10	12	14	16	18
30	Area of a Round duct (Sqft)	0.087	0.136	0.196	0.267	0.349	0.545	0.785	1.069	1.396	1.767
31
32	Intermediate values in the METHOD B formula
33	Kv	2225	2325	2400	2450	2480	2490	2500	2525	2550	2550
34	Velocity in FPM	242	253	261	266	269	270	272	274	277	277
35	Diameter of round duct (in.)	4	5	6	7	8	10	12	14	16	18
36	Area of a Round duct (Sqft)	0.087	0.136	0.196	0.267	0.349	0.545	0.785	1.069	1.396	1.767
37
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39	Not responsible for errors or omissions.		Call 1-888-224-3437 or visit us at www.TruTechTools.com					Or email: Bill@TruTechTools.com
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