Dynamic Hoist Load Tester (DHLT)
Calibration Procedure
H
ARRINGTON
H
OISTS
,
I
NC
.
C
ONFIDENTIAL
2 of 4
General Use
EDOC0430
Rev. 01 10-5-2016
a.
5 Ton link:
i.
Adjust cylinder pressure up to 200 psi and record dynamometer reading.
ii.
Adjust cylinder pressure up from 200 psi to 1300 psi in 100 psi increments
recording the dynamometer reading at each increment.
iii.
Adjust cylinder pressure just slightly above 1300 psi then back down to 1300 psi
and record dynamometer reading.
iv.
Adjust cylinder pressure down from 1300 psi to 200 psi in 100 psi increments,
recording the dynamometer reading at each increment.
v.
Average the two dynamometer readings for each cylinder pressure increment
recorded and record these results onto the DHLT Calibration Data Sheet.
vi.
Adjust cylinder pressure to zero.
vii.
Use the Test Hoist to lower the lower beam assembly to its fully lowered
position; this will remove the load from the Test Hoist.
viii.
Remove the Test Hoist, dynamometer, and associated shackles from the DHLT’s
5 Ton link and attach them to the DHLT’s 10 Ton link.
b.
10 Ton Link
i.
Repeat steps 1(h) and 1(i) above.
ii.
Adjust cylinder pressure up to 200 psi and record dynamometer reading.
iii.
Adjust cylinder pressure up from 200 psi to 700 psi in 100 psi increments,
recording the dynamometer reading at each increment.
iv.
Adjust cylinder pressure just slightly above 700 psi, and back down to 700 psi,
and record dynamometer reading.
v.
Adjust cylinder pressure down from 700 psi to 200 psi in 100 psi increments,
recording the dynamometer reading at each increment.
vi.
Average the two dynamometer readings for each cylinder pressure increment
recorded, and record these results onto the DHLT Calibration Data Sheet.
vii.
Use the Test Hoist to lower the lower beam assembly to its fully lowered
position; this will remove the load from the Test Hoist.
viii.
Remove the Test Hoist, dynamometer, and associated shackles from the DHLT’s
10 Ton link.
2.
Prepare Calibration Chart
(a)
Enter the date and the DHLT serial number in the designated areas in the upper left-hand
area of the calibration spreadsheet (Request DHLT Cal rev00.xls from Harrington).
(b)
Enter the “Average” values from the DHLT Calibration Data Sheet into the corresponding
yellow-colored cells of the calibration spreadsheet. This will cause the spreadsheet to (i)
generate two lines on the graph area of the spreadsheet, and (ii) enter values in the table
area (load vs. pressure) of the spreadsheet.