OHAUS Explorer Balances User manual

Explorer®Balances
Service Manual

TABLE OF CONTENTS
Ohaus Corporation www.ohaus.com i Explorer®Service Manual
Page No.
1 GETTING STARTED 1
1.1 INTRODUCTION 1
1.2 SERVICE FACILITIES 1
1.3 TOOLS AND TEST EQUIPMENT REQUIRED 2
1.4 SPECIFICATIONS 2
1.5 UNIT CAPACITY AND READABILITY 5
1.6 BALANCE OPERATION 8
1.6.1 Overview of the Controls 8
1.6.2 Main Menu and Principal Functions 9
1.6.3 Menu Navigation 9
1.6.4 Changing Settings 10
1.6.5 Functions and Icons 10
1.7 LEGAL FOR TRADE (LFT) 12
1.8 MENU STRUCTURE 13
1.8.1 User Menu 13
1.8.2 Diagnostics Menu 13
1.9 Securing the Menu and Key Lock menu settings 14
1.10 Display Touch Areas 14
2 DIAGNOSTIC GUIDE 16
2.1 TROUBLESHOOTING 16
2.2 SOFTWARE 16
2.3 DIAGNOSTIC GUIDE 16
3 MAINTENANCE / REPAIR PROCEDURES 20
3.1 PREVENTIVE MAINTENANCE 20
3.2 OPENING THE BALANCE 20
3.2.1 Preparation for Opening Explorer®Models 20
3.2.2 Opening the Terminal Module 22
3.2.3 Opening the Base Module with a Draftshield 24
3.2.4 Opening the Base Module (Top Loader) 26
3.2.5 Opening the Base Module (EX12001, EX24001, EX35001) 28
1. Prepare the balance as instructed above. 28
2. Remove the 2 screws that hold the Spider to the Top Housing and lift off the Spider. 28
3. Remove the 7 screws that hold the Top Housing to the Base. 28
4. Remove the Top Housing 29
3.3 REPLACING THE LOAD CELL (not 12001, 24001 and 35001) 29
3.4 REPLACING THE LOAD CELL (12001, 24001 and 35001) 35
3.5 REMOVING LOAD CELL PROTECTION SCREWS 36
3.6 REPLACING THE PRINTED CIRCUIT BOARD ASSEMBLIES (PCBA) 37
3.2.5 Terminal 37
3.2.6 Base 39
3.7 Replacing the Function Label 42
3.8 Replacing the Touch Panel 43
3.9 Replacing the Feet 43
4 TESTING 45
4.1 TEST MASSES REQUIRED 45
4.2 OPERATIONAL TEST 46
4.3 LOAD CELL TEST USING RAMP 46
4.4 PERFORMANCE TESTS 46

TABLE OF CONTENTS
Explorer®Service Manual ii Ohaus Corporation www.ohaus.com
4.4.1 Precision Test 46
4.4.2 Repeatability Test (non-approved models) 47
4.4.3 Repeatability Test –Approved models 49
4.4.4 Linearity Test 49
4.4.5 Off-Center Load Test 50
5 PARTS LISTS & DIAGRAMS 52
5.1 TERMINAL SPARE PARTS 53
5.2 BASE SPARE PARTS (Non-Draftshield models) 55
5.3 BASE SPARE PARTS (Draftshield models) 57
5.4 BASE SPARE PARTS (EX12001, EX24001, EX35001) 59
5.5 DRAFTSHIELD SPARE PARTS 61
APPENDIX A - USER CALIBRATIONS 63
A.1 SPAN CALIBRATION 63
A.2 LINEARITY CALIBRATION 64
A.3 TOUCH SCREEN CALIBRATION 64
APPENDIX B - DIAGNOSTIC / SERVICE MENU 65
B.1 User Accessible Diagnostics 65
B.2 Service Sub-Menu 66
APPENDIX C –SERVICE TOOL 70
C.1 Balance Commands 71
C.2 RS232 (DB9) Pin Connections 74
C.3 USB Interface 74
APPENDIX D –FIRMWARE UPGRADE VIA USB 70

TABLE OF CONTENTS
Ohaus Corporation www.ohaus.com iii Explorer®Service Manual
LIST OF TABLES
TABLE NO. TITLE Page No.
1-1 Specifications..............................................................................................................2
1-2 Capacity and Readability............................................................................................5
1-3 Menu and Screen Navigation .....................................................................................8
1-4 LFT Settings .............................................................................................................11
1-5 Explorer®User Menu ................................................................................................12
2-1 Diagnostic Guide ......................................................................................................16
4-1 Calibration Mass Values...........................................................................................39
4-2 Repeatability Worksheet ..........................................................................................42
4-3 Linearity Test –Reference and Load Masses .........................................................43
4-4 Off Center Load Mass Values ..................................................................................44
5-1 Terminal Spare Parts................................................................................................48
5-2 Base Spare Parts (Non-Draftshield Models)............................................................50
5-3 Base Spare Parts (Draftshield Models)....................................................................52
5-4 Draftshield Spare Parts ............................................................................................54
B-1 Service Calibration Mass Values .............................................................................60
C-1 Interface Command List ...........................................................................................74

CHAPTER 1 - GETTING STARTED
Explorer®Series Service Manual 1Ohaus Corporation www.ohaus.com
1 GETTING STARTED
1.1 INTRODUCTION
This service manual contains the information needed to perform routine maintenance and service
on the Ohaus Explorer®Series balances. Familiarity with the balance’sInstruction Manual is
assumed. The contents of this manual are contained in five chapters:
Chapter 1 - Getting Started –Contains information on service facilities, tools, specifications, and
the mechanical and electronic functions of the balance.
Chapter 2 - Troubleshooting –Contains a diagnostic guide and error code table.
Chapter 3 - Maintenance Procedures –Contains preventive maintenance procedures and
disassembly, repair and replacement procedures.
Chapter 4 - Testing –Contains a list of required test masses, an operational test, segment display
test, performance tests and adjustments.
Chapter 5 - Drawings and Parts Lists –Contains exploded views of Explorer®balances identifying
all serviceable components.
Appendix A - User Calibrations –Explains user calibration procedures that may need to be
performed during service.
Appendix B - Service Calibration –Describes the Service Menu and sub-menus, which allow
authorized service personnel to see Ramp readings and perform service calibrations.
Appendix C - Software Service Tool Instructions –Used to re-configure the balance after
replacing a Printed Circuit Board or Load-cell.
1.2 SERVICE FACILITIES
To service a balance, the service area should meet the following requirements:
Should be temperature controlled and meet balance specifications for temperature
environmental requirements.
Must be free of vibrations such as fork lift trucks close by, large motors, air currents or drafts
from air conditioning/heating ducts, open windows, people walking by, fans, etc.
Area must be clean and free of excessive dust.
Work surface must be stable and level.
Balance must not be exposed to direct sunlight or radiating heat sources.
Handle all electronic assemblies with appropriate Electro-Static protection.

CHAPTER 1 - GETTING STARTED
Ohaus Corporation www.ohaus.com 2 Explorer®Series Service Manual
1.3 TOOLS AND TEST EQUIPMENT REQUIRED
Common hand tools are sufficient to disassemble the Explorer®balances.
A PC running Microsoft Windows XP or later.
Explorer®Software Service Tool, PN 83032124
RS232 Cable –Balance to PC PN 80500525
Digital voltmeter (DVM) with an input impedance of at least 10 meg-ohms at 1 volt DC.
Masses as shown in Table 4-1.
1.4 SPECIFICATIONS
Specifications for the Ohaus Explorer®Balances are listed in Table 1-1. When a balance has been
serviced, it must meet the specifications listed in the table. Before servicing the balance, determine
what specifications are not met.
Special Note regarding Approved balances:
The specifications for the approved balances below are only for initial testing. These balances must
be tested according to the requirements of the local Weights and Measures authority. Before
returning the balance to service an approved representative of the local Weights and Measures
authority must certify the balance.
Ambient conditions
Indoor use only
Altitude: Up to 2000 m
Specified Temperature range: 10°C to 30°C
Humidity: maximum relative humidity 80 % for temperatures up to 31°C, decreasing linearly to
50% relative humidity at 40°C
Mains supply voltage fluctuations: up to -15% to +10% of the nominal voltage
Over voltage category II
Pollution degree: 2
Operability is assured at ambient temperatures between 5°C and 40°C
TABLE 1-1 SPECIFICATIONS
EX with Draftshield (non-Approved)
Model
EX124
EX224
EX324
EX223
EX423
EX623
EX1103
Capacity (g)
120
220
320
220
420
620
1100
Readability d (g)
0.0001
0.0001
0.0001
0.001
0.001
0.001
0.001
Repeatability (g) (1d)
0.0001
0.0001
0.0001
0.001
0.001
0.001
0.001
Linearity (g) (2d)
0.0002
0.0002
0.0002
0.002
0.002
0.002
0.002
OCL (g) (4.5d)
see Table 4-4 for load
0.00045
0.00045
0.00045
0.0045
0.0045
0.0045
0.0045
Zero Drift (g/°C)
0.0001
0.0001
0.0001
0.001
0.001
0.001
0.001
Span Sensitivity (g/°C)
0.0001
0.0001
0.0001
0.001
0.001
0.001
0.001

CHAPTER 1 - GETTING STARTED
Explorer®Series Service Manual 3Ohaus Corporation www.ohaus.com
EX without Draftshield (non-Approved)
Model
EX2202
EX4202
EX6202
EX10202
EX6201
EX10201
Capacity (g)
2200
4200
6200
10,200
6200
10,200
Readability d (g)
0.01
0.01
0.01
0.01
0.1
0.1
Repeatability (g) (1d)
0.01
0.01
0.01
0.01
0.1
0.1
Linearity (g)
0.02
0.02
0.02
0.02
0.1
0.1
OCL (g)
see Table 4-4 for load
0.045
0.045
0.045
0.045
0.35
0.35
Zero Drift (g/°C)
0.01
0.01
0.01
0.01
0.1
0.1
Span Sensitivity (g/°C)
0.01
0.01
0.01
0.01
0.1
0.1
EX (EC / OIML Type Approved)
These models must meet all EC / OIML requirements.
Model
EX224M
EX324M
EX423M
EX1103M
EX4202M
EX10202M
EX10201M
Capacity (max) (g)
220
320
420
1100
4200
10200
10200
Readability d (g)
0.0001
0.0001
0.001
0.001
0.01
0.01
0.1
Ver. Interval e (g)
0.001
0.001
0.01
0.01
0.1
0.1
0.1
LFT Class
I
I
II
I
II
I
I
Repeatability (10 times
each load) (load / MPE)
100g / 0.001g
200g / 0.001g
150g / 0.001g
300g /
0.0015g
200g / 0.01g
400g / 0.015g
500g / 0.005g
1000g / 0.01g
2000g / 0.1g
4000g / 0.15g
5000g / 0.05g
10000g / 0.1g
5000g / 0.05g
10000g / 0.1g
Linearity (g)
reference only
0.0002
0.0002
0.003
0.0024
0.03
0.024
0.024
OCL (load / MPE)
see Table 4-5 for load
100g /
± 0.001g
100g /
± 0.001g
200g /
± 0.01g
500g /
± 0.005g
2000g /
± 0.1g
3500g /
± 0.05g
3500g /
± 0.05g
Zero Drift (1e / 1°C)
0.001g /
1°C
0.001g /
1°C
0.01g /
1°C
0.01g /
1°C
0.1g / 1°C
0.1g / 1°C
0.1g / 1°C
Span Sensitivity
(MPE /°C @ max)
0.0015g
0.0015g
0.015g
0.01g
0.15g
0.1g
0.1g

CHAPTER 1 - GETTING STARTED
Ohaus Corporation www.ohaus.com 4 Explorer®Series Service Manual
EX (NTEP / MC Type Approved)
These models must meet all NTEP and Canadian Weight & Measures requirements.
Model
EX224N
EX324N
EX423N
EX1103N
EX4202N
EX10202N
EX10201N
Capacity (g)
220
320
420
1100
4200
10200
10200
Readability d (g)
0.0001
0.0001
0.001
0.001
0.01
0.01
0.1
Ver. Interval e (g)
0.001
0.001
0.01
0.01
0.1
0.1
1
LFT Class
I
I
II
I
II
I
I
Repeatability (10
times each load) (load
/ MPE)
100g /
0.001g
200g /
0.001g
150g /
0.001g
300g /
0.0015g
200g /
0.01g
400g /
0.015g
500g /
0.005g
1000g /
0.01g
2000g /
0.1g
4000g /
0.15g
5000g /
0.05g
10000g /
0.1g
5000g /
0.05g
10000g /
0.1g
Linearity (g)
reference only
0.0002
0.0002
0.003
0.0024
0.03
0.024
0.024
OCL (load / MPE)
see Table 4-5 for load
100g /
± 0.001g
100g /
± 0.001g
200g /
± 0.01g
500g /
± 0.005g
2000g /
± 0.1g
3500g /
± 0.05g
3500g /
± 0.05g
Zero Drift (1e / 1°C)
0.001g /
5°C
0.001g /
5°C
0.01g /
5°C
0.01g /
5°C
0.1g /
5°C
0.1g /
5°C
0.1g /
5°C
Span Sensitivity
(MPE /°C @ max)
0.0015g
0.0015g
0.015g
0.01g
0.15g
0.1g
0.1g
EX High Capacity
Model
EX12001
EX24001
EX35001
Capacity (max) (g)
12000 g
24000 g
35000 g
Readability d (g)
0.1 g
Ver. Interval e (g)
1g
LFT Class
II
Repeatability (10 times
each load) (load / MPE)
1d
Linearity (g)
reference only
+0.2 g

CHAPTER 1 - GETTING STARTED
Explorer®Series Service Manual 5Ohaus Corporation www.ohaus.com
AutoDoor models
Model
EX124AD
EX224AD
EX324AD
Capacity (g)
120
220
320
Readability d (g)
0.0001
0.0001
0.0001
Repeatability (g) (1d)
0.0001
0.001
0.001
Linearity (g) (2d)
0.0002
0.0002
0.0002
OCL (g) (4.5d)
see Table 4-4 for load
0.00045
100g / 0.001g
200g / 0.001g
150g / 0.001g
300g / 0.0015g
Zero Drift (g/°C)
0.0001
0.0002
0.0002
Span Sensitivity (g/°C)
0.0001
100g /
± 0.001g
100g /
± 0.001g
ExCal models
Model
EX223E
EX423E
EX2202E
EX4202E
EX6202E
EX6201E
Capacity (g)
220
420
320
4200
6200
6200
Readability d (g)
0.001
0.001
0.0001
0.01
0.01
0.1
Repeatability (g) (1d)
0.001
0.001
0.001
0.01
0.01
0.1
Linearity (g) (2d)
0.002
0.002
0.02
0.02
0.02
0.1
OCL (g) (4.5d)
see Table 4-4 for load
0.0045
0.0045
150g / 0.001g
300g / 0.0015g
0.045
0.045
0.35
Zero Drift (g/°C)
0.001
0.001
0.0002
0.01
0.01
0.1
Span Sensitivity (g/°C)
0.001
0.001
100g /
± 0.001g
0.01
0.01
0.1
Note: MPE - Maximum Permissible Error
MPE
For loads (m) in verified units (e)
Class I
Class II
± 0.5 e
0≤m≤50,000
0≤m≤5000
± 1 e
50,000<m≤200,000
5000<m≤20,000
± 1.5 e
200,000<m
20,000<m≤1000,000
Maximum errors for balances in usage are twice the acceptable errors for initial verification.

CHAPTER 1 - GETTING STARTED
Ohaus Corporation www.ohaus.com 6 Explorer®Series Service Manual
UNIT CAPACITY AND READABILITY
The capacity and readability of the available units of measure are listed in Table 1-2.
TABLE 1-2 UNIT CAPACITY (Max) AND READABILITY (d)
Units
EX124
EX224
EX324
EX223
EX423
EX623
EX1103
grams
120.0000
220.0000
320.0000
620.000
420.000
620.000
1100.000
0.0001
0.0001
0.0001
0.001
0.001
0.001
0.001
lb
n/a
n/a
n/a
0.485015
0.925940
1.366865
2.425085
n/a
n/a
n/a
0.000005
0.000005
0.000005
0.000005
dwt
77.1618
141.4633
205.7648
141.463
270.066
398.669
707.316
0.0001
0.0001
0.0001
0.001
0.001
0.001
0.001
t(HK)
3.206070
5.87795
8.549520
5.87780
11.22125
16.56470
29.38900
0.000005
0.000005
0.000005
0.00005
0.00005
0.00005
0.00005
t(Sing)
3.174655
5.820205
8.465750
5.82020
11.11130
16.40240
29.10100
0.000005
0.000005
0.000005
0.00005
0.00005
0.00005
0.00005
t(ROT)
3.200000
5.866665
8.533335
5.86665
11.20000
16.53335
29.33335
0.000005
0.000005
0.000005
0.00005
0.00005
0.00005
0.00005
ti
7.34874
13.47269
19.59664
13.4727
25.7206
37.9685
67.3635
0.00001
0.00001
0.00001
0.0001
0.0001
0.0001
0.0001
kg
n/a
0.220000
0.420000
0.620000
1.100000
n/a
0.000001
0.000001
0.000001
0.000001
ozt
3.868090
7.073165
10.288240
7.07315
13.50330
19.93345
35.36585
0.000005
0.000005
0.000005
0.00005
0.00005
0.00005
0.00005
m
32.00000
58.6665
85.3335
58.6665
112.0000
165.3335
293.3335
0.00005
0.00005
0.00005
0.0005
0.0005
0.0005
0.0005
N
1.176798
2.157463
3.138128
2.15746
4.11879
6.08013
10.78733
0.000001
0.000001
0.000001
0.00001
0.00001
0.00001
0.00001
oz
4.232875
7.760270
11.287665
7.76025
14.81505
21.86985
38.80135
0.000005
0.000005
0.000005
0.00005
0.00005
0.00005
0.00005
ct
600.0000
1100.000
1600.000
1100.000
2100.000
3100.000
5500.000
0.0005
0.0005
0.0005
0.005
0.005
0.005
0.005
GN
1851.882
3395.118
4938.354
3395.12
6481.58
9568.06
16975.60
0.002
0.002
0.002
0.02
0.02
0.02
0.02
msg
26.03985
47.73975
69.439650
47.7400
91.1395
134.5395
238.6990
0.00005
0.00005
0.00005
0.0005
0.0005
0.0005
0.0005
baht
7.91557
14.51187
21.10818
14.5119
27.7045
40.8971
72.5594
0.00001
0.00001
0.00001
0.0001
0.0001
0.0001
0.0001
custom(3)
tola
10.28824
18.86177
27.43530
18.8619
36.0088
53.1559
94.3089
0.00001
0.00001
0.00001
0.0001
0.0001
0.0001
0.0001
mg
120000.0
220000.0
320000.0
220000
420000
620000
1100000
0.1
0.1
0.1
1
1
1
1

CHAPTER 1 - GETTING STARTED
Explorer®Series Service Manual 7Ohaus Corporation www.ohaus.com
Units
EX2202
EX4202
EX6202
EX10202
EX6201
EX10201
EX12001
EX24001
EX35001
grams
2200.00
4200.00
6200.00
11000.00
6200.0
11000.0
12000.0
24000.0
35000.0
0.01
0.01
0.01
0.01
0.1
0.1
0.1
0.1
0.1
lb
4.85015
9.25940
13.66865
22.48715
13.6685
22.4870
26.45547
52.91094
77.16179
0.00005
0.00005
0.00005
0.00005
0.0005
0.0005
0.0005
0.0005
0.0005
dwt
1414.63
2700.66
3986.69
6558.75
3986.7
6558.8
7 716.2
15 432.4
22 506.0
0.01
0.01
0.01
0.01
0.1
0.1
0.1
0.1
0.1
t(HK)
58.770
112.2125
165.6470
272.5160
165.645
272.515
320.64
641.28
935.20
0.0005
0.0005
0.0005
0.0005
0.005
0.005
0.005
0.005
0.005
t(Sing)
58.2020
111.1130
164.0240
269.8460
164.025
269.845
317.52
635.04
926.1
0.0005
0.0005
0.0005
0.0005
0.005
0.005
0.005
0.005
0.005
t(ROT)
58.6665
112.0000
165.3335
272.0000
165.335
272.000
320.0000
640.0000
933.3306
0.0005
0.0005
0.0005
0.0005
0.005
0.005
0.005
0.005
0.005
ti
134.727
257.206
379.685
624.643
379.68
624.64
735
1470
2143.75
0.001
0.001
0.001
0.001
0.01
0.01
0.01
0.01
0.01
kg
2.20000
4.20000
6.20000
10.20000
6.2000
10.2000
12.000
24.000
35.000
0.00001
0.00001
0.00001
0.00001
0.0001
0.0001
0.0001
0.0001
0.0001
ozt
70.7315
135.0330
199.3345
327.9375
199.335
327.940
385.809
771.618
1 125.276
0.0005
0.0005
0.0005
0.0005
0.005
0.005
0.005
0.005
0.005
m
586.665
1120.000
1653.335
2720.000
1653.35
2720.00
3200.40
6400.80
9334.5
0.005
0.005
0.005
0.005
0.05
0.05
0.05
0.05
0.05
N
21.5746
41.1879
60.8012
100.0278
60.801
100.028
117.696
235.392
343.28
0.0001
0.0001
0.0001
0.0001
0.001
0.001
0.001
0.001
0.001
oz
77.6025
148.1505
218.6985
359.7946
218.700
359.795
423.288
846.575
1 234.589
0.0005
0.0005
0.0005
0.0005
0.005
0.0005
0.0005
0.0005
0.0005
ct
11000.00
21000.00
31000.00
510000.00
31000.0
510000.0
60000.0
120000.0
175000.0
0.05
0.05
0.05
0.05
0.5
0.05
0.05
0.05
0.05
GN
33951.2
64815.8
95680.6
157410.0
95680
157410
185208
370416
540190
0.2
0.2
0.2
0.2
2
2
2
2
2
msg
477.400
911.395
1345.395
2213.390
1345.40
2213.40
2604.60
5209.2
7596.75
0.005
0.005
0.005
0.005
0.05
0.05
0.05
0.05
0.05
baht
145.119
277.045
408.971
672.823
408.97
672.82
800.00
1600.00
2333.33
0.001
0.001
0.001
0.001
0.01
0.001
0.001
0.001
0.001
custom(3)
tola
188.618
360.088
531.559
874.500
531.56
874.50
1028.82
2057.65
3000.74
0.001
0.001
0.001
0.001
0.01
0.01
0.01
0.01
0.01
mg
22000000
4200000
6200000
10200000
6200000
10200000
12000000
24000000
35000000
10
10
10
10
100
100
100
100
100

CHAPTER 1 - GETTING STARTED
Ohaus Corporation www.ohaus.com 8 Explorer®Series Service Manual
1.5 BALANCE OPERATION
The Explorer®is a very simple to use yet sophisticated balance. Please refer to the Explorer®
Instruction Manual for complete information on the set up and use of the balance.
1.5.1 Overview of the Controls
Touch to access application setup menu
Touch to change
applications
Touch to access
available libraries
Instructional Messages
Touch for information
menu
Stability (*), Net (NET),
Gross (G) and/or center
of zero (>0<) indicators
Touch unit indicator to
change weighing unit
Capacity or Status Guides:
Vary by application
Result Fields:
Information varies by
application
Application Buttons:
Functions vary by
application
Touch icons to perform
specific functions or
access other functions

CHAPTER 1 - GETTING STARTED
Explorer®Series Service Manual 9Ohaus Corporation www.ohaus.com
1.5.2 Main Menu and Principal Functions
TABLE 1-3 MENU AND SCREEN NAVIGATION
Touch Menu to open the menu list.
Touch and drag the Scroll bar to view additional items.
Calibration:
Touch to view calibration options.
User Settings:
Touch to view user preferences.
Balance Setup:
Touch to view balance settings.
Application Modes:
Touch to view application modes.
Weighing Units:
Touch to view weighing units.
GLP and GMP Data:
Insert user data for traceability.
Diagnostics:
Touch to view library items.
Communication:
Touch to view COM Device Settings and
Print Settings.
Factory Reset:
Touch to view diagnostics list.
Library:
Touch to view library items.
Lockout:
Touch to view diagnostics list.
I/O Settings:
Touch to view library items.
Information:
Touch to view list of topics.
1.5.3 Menu Navigation
All menu navigation is performed by touching the display. To enter the Menu, touch Menu from
any Application Home screen. The Main menu appears, with buttons for Main, Back and Done.
Continue touching the appropriate list item to navigate to the Menu items or touch a button to
change location.

CHAPTER 1 - GETTING STARTED
Ohaus Corporation www.ohaus.com 10 Explorer®Series Service Manual
1.5.4 Changing Settings
These Icons are available to setup and operate the Balance. Refer to the Instruction Manual for
more information.
To change a menu setting, navigate to that setting using the following steps:
Enter the Menu
From any Application screen, Touch Menu.
The Main Menu List appears on the display.
Select the Sub-Menu
Scroll down to the selected item of the Main
Menu List and touch it. The Sub-Menu
appears.
Select the Menu Item
Continue until the desired setting is chosen in
the Menu list. Touch the setting to change it.
The changed setting will be displayed as
highlighted for 2 seconds to confirm the
changed value.
Exit the Menu and Return to the Current Application
After the setting is confirmed, touch Home to return to the Application.
Note: at any time the Main, Back & Done buttons can be touched to navigate to the desired area of
the menu or return to the current Application.
1.5.5 Functions and Icons
These Icons are available to setup and operate the Balance. Refer to the Instruction Manual for
more information.
Standby
Touch Standby to shut down the display.
Note: After initial start-up, in Standby your balance needs no warm-up time and is immediately
available for weighing by touching the Start-up icon.
Printing Data
Touch Print to send the displayed value to a printer or computer via the active COM port.
Note: Ensure proper setup of connections, printing and interface parameters.
Note: Data may also be printed using the Touchless Sensors by configuring these for Printing.
Data may also be printed using the P command from a computer connected to the COM port.
Applications
The balance can be configured to operate in various Application modes.
Touch Applications to choose –or the top button in the Application area.
TouchLess Sensor Status
Explorer®balances have four TouchLess sensors that can be assigned a unique function when
activated (e.g., zero, print, tare, etc).
To assign a task for each TouchLess sensor, press TouchLess Sensor.
Note: To activate a sensor, move an object over it (from a distance of 1-2 inches or 3 cm). The
sensor shows a green light and beeps when activated. If the sensor cannot be activated (sensor
is disabled during certain instances, like when the Menu is displayed) the sensor shows a red
light.

CHAPTER 1 - GETTING STARTED
Explorer®Series Service Manual 11 Ohaus Corporation www.ohaus.com
AutoCal
When AutoCal is ON, the balance performs a self-calibration following a temperature change of
1.5° C (for 4-place and 3-place models) and 6.5° C for (for 2-place balances), or every 11 hours.
Touch AutoCal to change the status. (Default status is ON.)
Note: Not available in ExCal
Menu
Touch Menu toenterthebalance’smenulist.
More…
Touch More to access Level Assist, Zero, Tare, Units, Pretare, Cal Test, Calculator, and
Stopwatch.
Zero Operation
Remove the load from the pan and touch Zero to set the display to zero. When weighing pan is
empty, the >0< indicator turns on when the measurement is within + ¼division (d) of the zero
setting.
Note: The balance also features Auto Zero Tracking (AZT) that automatically maintains a
Center of Zero within the tolerances set in the AZT menu (see Balance Settings).
Weighing Units
The balance can be configured to measure in a variety of weighing units, including three (3)
custom units. Touch Units to choose from the displayed list. (Scroll down to see all options.)
Note: The active weighing Unit can also be accessed by touching the unit area of the Main
Display line; If a unit is not displayed in the list, it must first be turned on via the User Menu.
or
Taring a Container
Taring sets the weight of a container as zero, so only the weight of objects held in the container
(net weight) is displayed.
Manual Tare –Place the empty container on the pan and touch Tare when stable.
Add material to the container. The net weight of the material is displayed.
To clear the Tare value, remove the container from the pan and touch Tare.
Preset Tare
A preset tare may be entered using a computer connected to the COM port. To enter a Preset
Tare, send the xT command to the balance where x is the value in grams. Enter a value of 0 to
clear the Preset Tare. The display will show the PT symbol and the tare value as a negative
number.
Auto Tare
Automatically tares the first item placed on the pan.
To use Auto Tare set it to ON in the Balance Setup menu. The message line shows Place
container. When the container is placed on the pan, it is automatically tared and the Net weight
is displayed. The Tare value is automatically cleared when the container is removed from the
pan.
Calibration Test
Calibration Test is used to compare a known calibration weight against the last stored span
calibration data.
Internal Calibration
Touch Internal Calibration to initiate a calibration using the internal weight.
Stopwatch
To use the built-in stopwatch application, touch Stopwatch. A countdown timer with interval
(lap) timer is available.
Calculator
To use the built-in calculator application, touch Calculator. The calculator has four functions,
addition, subtraction, multiplication and division.

CHAPTER 1 - GETTING STARTED
Ohaus Corporation www.ohaus.com 12 Explorer®Series Service Manual
Logout
Used for User logout and return to User Login screen. This feature is only active if a user profile
has been created.
1.6 LEGAL FOR TRADE (LFT)
When the balance is set for LFT (on “M” and“N”models), the following menu settings cannot be
accessed / changed: Calibration, Mode and Units. Type approved operation may force some
balance settings as required by the approval agency.
In non-approved models the Menu lock switch may also limit access to certain menu items based on
the Balance lock out settings. The Service Menu (see section 1.8.2) is not available when the switch
is“on”.
To regain access to the locked menu settings, move the Menu lock switch to the rear, which turns
LFT off.
TABLE 1-4 LFT SETTINGS
Legal For Trade
Use this menu to set the Legal for Trade status.
OFF = standard operation.
ON = operation complies with Weights and Measures regulations.
When Legal for Trade is set to ON, the menu settings are affected as
follows:
Calibration Menu
AutoCal internal Calibration, Automatic Calibration, and Calibration
Test functions are available.
All other functions are hidden.
Balance Setup Menu
Stability Indicator Range is locked at 1 Division.
Auto Zero Tracking is limited to 0.5 Division and OFF.
Auto Tare and Gross Indicator are locked at their current setting.
Graduations is locked at 1 Division.
Communication Menu
Stable Weight Only is locked ON.
Numeric Value Only is locked OFF.
Auto print mode selections are limited to OFF, On Stability, and
Interval. Continuous is not available.
Explorer switch
Explorer High Capacity
Note:
The security switch under the Base must be in the locked position to set
Legal for Trade to ON. The security switch must be in the unlocked position
to set Legal for Trade to OFF.
After the Menu Lock setting has been turned off, the balance must be inspected in accordance with
local weights and measures regulations before it can be used in LFT mode again. Local authorities
may secure the switch using paper seals, wire seals or plastic ties.
Note:“M”and“N”models- WhentheMenuLockswitchissetto“on”certainmenuitemswillbe
forced to the required setting and the required menus will be locked.

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Explorer®Series Service Manual 13 Ohaus Corporation www.ohaus.com
1.7 MENU STRUCTURE
Programmable features of the Explorer®are accessed through a graphical interface using the
Display Touch Panel. By touching an item on the display a further set of options will appear.
1.7.1 User Menu
For more detail on using the menu, see the Explorer®Instruction Manual.
TABLE 1-5 EXPLORER®USER MENU
Calibration
User
Settings
Balance
Setup
Applications
Weighing
Units
GLP and
GMP Data
Communication
Library
I/O
Settings
Diagnostics
Factory
Reset
Lockout
Information
1.7.2 Diagnostics Menu
This menu used to access the balances Service Menu and also can be used to verify the
operation of some features.
Level Bubble Light (not available in EX12001, EX24001 and EX35001)
To verify proper operation of the illuminated Level Bubble. When selected, this light
should blink.
Draft Shield Light
To verify proper operation of the Draft Shield Light. When selected, this light should
blink.
Sensors
To verify proper operation of each Touchless Sensor. When operated, each sensor
should light and make a sound.
Automatic draftshield door
To verify proper operation of each Automatic Draftshield Door.
When operated, each door should move automatically.
Note: Only for Automatic draftshield door models
Service Menu
The Service Menu is intended for use by service personnel. A password is required
to access this menu; “Explorer”(SW 1.10) or “OHAUS”(SW 1.03).
The Service menu includes three sub-Menus; Ramp, Span Calibration and Internal
Calibration. See Appendix B for additional information.

CHAPTER 1 - GETTING STARTED
Ohaus Corporation www.ohaus.com 14 Explorer®Series Service Manual
1.8 Securing the Menu and Key Lock menu settings
A slide switch is used to secure the Menu Lock and Key Lock menu settings. When the switch is set
to the ON position, the Menu Lock and Key Lock menu settings may be viewed but not changed.
This switch is located under the Base.
Set the position of the switch to ON by sliding the external Lock Switch to LOCKED.
When the switch is in the ON position, the start up display includes the LOCK ON message.
Note: This switch is also used in conjunction with the Legal for Trade menu item. When the Legal
for Trade menu is set to ON, the switch must be set to the ON position to prevent calibration and
changes to metrologically significant settings.
Explorer Switch Explorer High Capacity (EX12001, EX24001, EX35001)
1.9 Display Touch Areas
The display touch areas that are active will change with the screen layout. Button areas will always
be active but some areas will require familiarity with the Explorer®man-machine interface.
Application with Single line:
95w x 19h mm
10w x 14h mm
16w x 15h mm