Tools And Test Equipment Required; Test Masses Required; Physical Description: Model Ckw Bases - OHAUS CKW3R Service Manual

CHAPTER 1 INTRODUCTION
1.3

TOOLS AND TEST EQUIPMENT REQUIRED

1. Common hand tools
2. Standard electronics tool kit
3. Digital Voltmeter (DVM) capable of reading from 1 mv to 50 V dc.)
4. Megohmetter (50 Volt dc maximum test voltage)
5. Desk magnifier on a stand
6. Ohaus Indicator: CKW-55, or equivalent commercial indicator
7. A calibrated Torque Wrench N.m. – Ft/Lbs
1.4

TEST MASSES REQUIRED

The masses required to test the Ohaus CKW Base when connected to an Indicator must meet
the requirements of ASTM Class 4 or OIML F2. Mass values 3kg to 30kg,depending on the
Base model. The full scale rated capacity of the Base should be used for Span calibration.
1.5 SERVICE STRATEGY
The Load Cells used in Ohaus Bases are non-repairable. The repair method for the Base is
direct replacement of Load Cells with connecting cable and hardware.
Each base contains the following basic replaceable assemblies: Platform, Load Cell with
Connecting Cable, and Down Stop and mounting hardware. There is an exploded view drawing
of the Base and associated parts list in Chapter 5. This service manual contains sufficient
information to isolate the problem, replace the component, test and restore the Base to its
original factory specifications.
1.6

PHYSICAL DESCRIPTION: MODEL CKW BASES

Construction
Overloading
Operating Environment
Ohaus Corporation www.ohaus.com
Platform – Fabricated stainless steel
Scale Base – Formed and welded base, 304 stainless steel
Load Cell – Stainless steel
Corner Loading – 100% of full capacity
Safe Overload – 150% of full capacity
Ultimate Overload – 300% of full capacity
Designed to meet OIML 3000e and NTEP 5000d requirements
to operate at a temperature range from –10°C to 40°C /
14°F to 104°F, 0 to 90% relative, non-condensing humidity
1-2 CKW Base Series Service Manual