PIX-Analog Tension Tester

Proper belt tension is essential for optimum power transmission and also for the life of the belt. To ensure optimum V-belt drive operation, it is recommended to check the tension in the belts by measuring the deflection force value (N) with the help of a tension measuring device. Belt tension in most of the drives can be checked with adequate reliability by means of PIX Belts Tension Tester.

Tension Measurement Procedure

Measure the span-length of the Belt in mm. (refer below sketch drawings)
Tie a string or a thread on the two pulleys along with the length of the Belt and mark the center of the span on the Belt.
Calculate 1.5% of the span (say ‘x’) for Belt length less than 1000 mm and 1.0% of the span for Belt length more than 1000 mm. Adjust lower ring on the tension tester on the millimeter scale to coincide, "x" mm with the lower side of the ring. Adjust lower side of the upper ring at 0.00 N.
Place tension tester at the center of the span of the Belt. Apply force with the help of tension tester perpendicular to the span, till the lower surface of the lower ring touches the string.
Read the deflection force value (N) on the Newton scale by taking reading at the lower side of the upper ring.
Compare the deflection force value (N) with the values given in the Table 'A'. The deflection force value (N) should lie between the minimum and maximum values given in the Table 'A'. (Next page)
Deflection force less than the minimum recommended value in the range indicates an under-tensioned drive & deflection force higher than the maximum recommended value indicates an over-tensioned drive

Important

For new Belts the deflection force value (N) should be kept at maximum.
Maximum deflection force value (N) is recommended for pulsating & shock loads.
It is recommended to re-check the Belt tension after approximately 24 hours of running and adjust the tension, if necessary.

Technical Specifications

Deflection force required for measuring tension in V-Belt drives
Cross Section	Smaller pulley diameter (mm)	Condition1 Deflection@1% of span, if span length is more than 1000mm			Condition2 Deflection@1.5% of span, if span length is less than 1000mm
Cross Section	Smaller pulley diameter (mm)	Required deflection force ‘F’ at the centre of span for Belt speed			Required deflection force ‘F’ at the centre of span for Belt speed
WRAPPED - CLASSICAL Belts
		0 m/s to 10 m/s Range (N)	10 m/s to 20 m/s Range (N)	< 20 m/s Range (N)	0 m/s to 10 m/s Range (N)	10 m/s to 20 m/s Range (N)	< 20 m/s Range (N)
Z	50-100 100 & above	4-6 6-9	4-5 6-7	3-4 5-6	5-8 8-12	5-7 8-9	4-5 7-8
A	71-140 140 & above	8-12 12-18	7-10 10-14	6-8 8-12	11-16 16-24	9-13 13-19	8-11 11-16
B	112-200 200 & above	16-24 24-35	13-19 19-29	10-16 16-24	21-32 32-47	17-25 25-39	13-21 21-32
C	180-400 400 & above	31-46 46-70	26-38 38-58	20-31 31-46	41-61 61-93	35-51 51-77	27-41 41-61
D	315-600 600 & above	62-90 90-134	52-76 76-115	42-62 62-90	83-120 120-179	69-101 101-153	56-83 83-120
E	450-915 915 & above	108-160 160-240	90-137 137-205	73-109 109-160	144-213 213-320	120-183 183-273	97-145 145-213
WRAPPED - WEDGE / NARROW Belts
SPZ / 3V	63-95 95 & above	8-12 12-17	7-10 10-16	6-9 9-14	11-16 16-23	9-13 13-21	8-12 12-19
SPA	90-140 140 & above	14-20 20-31	12-17 17-26	10-14 14-22	19-27 27-41	16-23 23-35	13-19 19-29
SPB / 5V	140-265 265 & above	25-36 36-46	20-32 32-41	18-27 27-37	33-48 48-61	27-43 43-55	24-36 36-49
SPC	224-355 355 & above	46-66 66-85	38-58 58-76	32-52 52-70	61-88 88-113	51-77 77-101	43-69 69-93
8V	335-520 520 & above	81-107 107-167	68-90 90-140	56-73 73-113	108-143 143-223	91-120 120-187	75-97 97-151

CUT EDGE - CLASSICAL V-Belts
ZX	40-100 100 & above	5-7 7-10	5-6 7-8	3-5 6-7	6-9 9-14	6-8 9-11	5-6 8-9
AX	63-140 140 & above	9-14 14-21	8-12 12-16	7-9 9-14	12-18 18-28	11-15 15-21	9-12 12-18
BX	90-200 200 & above	18-28 28-40	15-22 22-33	12-18 18-28	25-37 37-54	20-29 29-44	15-25 25-37
CX	140-400 400 & above	36-53 53-81	30-44 44-67	23-36 36-53	48-71 71-107	40-58 58-89	31-48 48-71
CUT EDGE - WEDGE / NARROW V-Belts
XPZ / 3VX	56-95 95 & above	9-14 14-20	8-12 12-18	7-10 10-16	12-18 18-26	11-15 15-25	9-14 14-21
XPA	71-140 140 & above	16-23 23-36	14-20 20-30	12-16 16-25	21-31 31-48	18-26 26-40	15-21 21-34
XPB / 5VX	112-265 265 & above	29-41 41-53	23-37 37-47	21-31 31-43	38-55 55-71	31-49 49-63	28-41 41-57
XPC	180-355 355 & above	53-76 76-98	44-67 67-87	37-60 60-81	71-101 101-130	58-89 89-117	49-80 80-107
Note: Maximum Belt linear speed (Classical section: up to 30 m/sec, Wedge: up to 42 m/sec), Narrow: up to 45 m/sec

Safety Instructions

Before measurement begins, switch off the drive mechanism to ensure that neither the drive shaft nor the driven shaft is caused to rotate unintentionally. The relevant safety instructions should also be observed.

If you would require any additional information, please write an e-mail to us at info@pixtrans.com