Property of Kerr Measurement Systems Inc. Page 2 of 15 Rev A.
Mar-2002
Rosenberg, TX 77471
Phone:
Fax:
Homepage: www.kerrms.com
E-Mail: [email protected]
6415 Reading Road
281-342-6415
281-342-4848
1.0 GENERAL DESCRIPTION
The Backup Depth System is designed to be an independent depth
measurement indicator for mounting inside a wireline unit. The depth is
measured by a magnetic pickup mounted in the measuring head and
displayed in either feet or meters at the display unit. The unit is designed to
be connected to an external AC or DC supply of the unit. In the event of an
external power interruption, the unit continues to operate normally on battery
power. Two batteries are used, with a warning indicator to show when the
first battery is exhausted. The unit conserves battery power by switching
itself off after a period of inactivity.
The unit is designed to operate without intervention from the user. When
external power fails, the depth display is maintained by the batteries. If the
magnetic pickup is inactive for more than one hour, the count is stored and
the unit switches it self off.
Front panel controls allow the operator to:
Zero the depth reading
Adjust the depth value
Select the display units (feet or meters), and
Switch the power off manually (for use when running on battery
power)
The unit is switched on:
Automatically, when external power is restored, or When the user
selects the
ENABLE
switch on the front panel
If the magnetic pickup is subjected to vibration, the displayed value
may oscillate or yo-yo. If the displayed value yo-yos, the system uses
an anti-yo-yo algorithm to set a value so that the unit can power off.
