Fluke 9100S User manual

9100S
Dry-Well Calibrator
User’s Guide
Rev. 811601
Hart Scientific

Rev. 811601
Fluke Corporation, Hart Scientific Division
799 E. Utah Valley Drive • American Fork, UT 84003-9775 • USA
Phone: [phone] • Telefax: +1.801.763.1010
E-mail: [email protected]
www.hartscientific.com
Subject to change without notice. • Copyright © 2005 • Printed in USA

Table of Contents
1 Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2.1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2.2 Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 Authorized Service Centers. . . . . . . . . . . . . . . . . . . . . . 5
2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Specifications and Environmental Conditions . . . . . . . . . . 9
3.1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.4 Setting the Temperature . . . . . . . . . . . . . . . . . . . . . . . 12
5 Parts and Controls . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2 Side View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.4 Constant Temperature Block Assembly . . . . . . . . . . . . . . . 16
6 General Operation . . . . . . . . . . . . . . . . . . . . . . . . 17
6.1 Setting the Temperature . . . . . . . . . . . . . . . . . . . . . . . 17
6.2 Changing Display Units . . . . . . . . . . . . . . . . . . . . . . . 17
7 Controller Operation . . . . . . . . . . . . . . . . . . . . . . . 19
7.1 Well Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.2 Temperature Set-point . . . . . . . . . . . . . . . . . . . . . . . . 19
7.2.1 Programmable Set-points . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.2.2 Set-point Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.2.3 Temperature Scale Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
i

7.3 Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.3.1 Scan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.3.2 Scan Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.4 Set-point Resistance . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.5 Secondary Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.6 Heater Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.7 Proportional Band . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.8 Controller Configuration . . . . . . . . . . . . . . . . . . . . . . 25
7.9 Operating Parameters . . . . . . . . . . . . . . . . . . . . . . . . 25
7.10 High Limit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.11 Serial Interface Parameters . . . . . . . . . . . . . . . . . . . . . 26
7.11.1 Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.11.2 Sample Period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.11.3 Duplex Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.11.4 Linefeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.12 Calibration Parameters . . . . . . . . . . . . . . . . . . . . . . . 28
7.12.1 Hard Cutout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.12.2 R0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.12.3 ALPHA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.12.4 DELTA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8 Digital Communication Interface . . . . . . . . . . . . . . . . 31
8.1 RS-232 Connection . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.2 Interface Commands . . . . . . . . . . . . . . . . . . . . . . . . 32
9 Test Probe Calibration . . . . . . . . . . . . . . . . . . . . . . 35
9.1 Calibrating a Single Probe. . . . . . . . . . . . . . . . . . . . . . 35
9.2 Dry-well Characteristics. . . . . . . . . . . . . . . . . . . . . . . 35
9.2.1 Stabilization and Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
10 Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . 37
10.1 Calibration Points . . . . . . . . . . . . . . . . . . . . . . . . . . 37
10.2 Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . 37
10.2.1 Compute DELTA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
10.2.2 Compute R0 and ALPHA. . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
10.2.3 Accuracy and Repeatability. . . . . . . . . . . . . . . . . . . . . . . . . . . 38
11 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
12 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . 41
12.1 Troubleshooting Problems, Possible Causes, and Solutions . . . . 41
12.2 CE Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
ii

12.2.1 EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
12.2.2 Low Voltage Directive (Safety) . . . . . . . . . . . . . . . . . . . . . . . . . 42
iii

iv
Figures
Figure 1 Back Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 2 Side View of the 9100S Showing the Prop Stand . . . . . . . . . . . . 14
Figure 3 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 4 Fixed-Block Options . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 5 Controller Operation Flow Chart. . . . . . . . . . . . . . . . . . . . . 20
Figure 6 Serial Cable Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

v
Tables
Table1 International Electrical Symbols . . . . . . . . . . . . . . . . . . . . . 1
Table 2 Controller Communications Commands . . . . . . . . . . . . . . . . . 33
Table 2 Controller Communications Commands continued . . . . . . . . . . . 34

1 Before You Start
1.1 Symbols Used
Table 1 lists the International Electrical Symbols. Some or all of these symbols
may be used on the instrument or in this manual.
Symbol Description
AC (Alternating Current)
AC-DC
Battery
Complies with European Union directives
DC
Double Insulated
Electric Shock
Fuse
PE Ground
Hot Surface (Burn Hazard)
Read the User’s Manual (Important Information)
Off
On
1
1 Before You Start
Symbols Used
Table1 International Electrical Symbols

Symbol Description
Canadian Standards Association
OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per IEC1010-1 re-
fers to the level of Impulse Withstand Voltage protection provided. Equipment of
OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from
the fixed installation. Examples include household, office, and laboratory appliances.
C-TIC Australian EMC
The European Waste Electrical and Electronic Equipment (WEEE) Directive
(2002/96/EC) mark.
1.2 Safety Information
Use this instrument only as specified in this manual. Otherwise, the protection
provided by the instrument may be impaired. Refer to the safety information in
the Warnings and Cautions sections below.
The following definitions apply to the terms “Warning” and “Caution”.
•“Warning” identifies conditions and actions that may pose hazards to the
user.
•“Caution” identifies conditions and actions that may damage the instru-
ment being used.
1.2.1 Warnings
To avoid personal injury, follow these guidelines.
GENERAL
•DO NOT use this instrument in environments other than those listed in
the User’s Guide.
•Inspect the instrument for damage before each use. DO NOT use the in-
strument if it appears damaged or operates abnormally.
•Follow all safety guidelines listed in the user’s manual.
•Calibration Equipment should only be used by Trained Personnel.
•If this equipment is used in a manner not specified by the manufacturer,
the protection provided by the equipment may be impaired.
•Before initial use, or after transport, or after storage in humid or semi-hu-
mid environments, or anytime the dry-well has not been energized for
more than 10 days, the instrument needs to be energized for a "dry-out"
period of 2 hours before it can be assumed to meet all of the safety re-
quirements of the IEC 1010-1. If the product is wet or has been in a wet
environment, take necessary measures to remove moisture prior to apply-
9100S Dry-well Calibrator
User’s Guide
2

ing power such as storage in a low humidity temperature chamber operat-
ing at 50 degree centigrade for 4 hours or more.
•DO NOT use this instrument for any application other than calibration
work. The instrument was designed for temperature calibration. Any other
use of the instrument may cause unknown hazards to the user.
•Completely unattended operation is not recommended.
•Overhead clearance is required. DO NOT place the instrument under a
cabinet or other structure. Always leave enough clearance to allow for
safe and easy insertion and removal of probes.
•If the instrument is used in a manner not in accordance with the equip-
ment design, the operation of the dry-well may be impaired or safety haz-
ards may arise.
•This instrument is intended for indoor use only.
BURN HAZARDS
•DO NOT turn the instrument upside down with the inserts in place; the
inserts will fall out.
•DO NOT operate near flammable materials.
•Use of this instrument at HIGH TEMPERATURES for extended periods
of time requires caution.
•DO NOT touch the well access surface of the instrument.
•The block vent may be very hot due to the fan blowing across the heater
block of the dry-well.
•The temperature of the well access is the same as the actual display tem-
perature, e.g. if the instrument is set to 375°C and the display reads
375°C, the well is at 375°C.
•For top loading dry-wells, the top sheet metal of the dry-well may exhibit
extreme temperatures for areas close to the well access.
•The air over the well can reach temperatures greater that 200°C for high
temperature (400°C and higher) dry-wells. Note: Probes and inserts may
be hot and should only be inserted and removed from the instrument
when the instrument is set at temperatures less than 50°C. Use extreme
care when removing hot inserts.
•DO NOT turn off the instrument at temperatures higher than 100°C. This
could create a hazardous situation. Select a set-point less than 100°C and
allow the instrument to cool before turning it off.
•The high temperatures present in dry-wells designed for operation at
300°C and higher may result in fires and severe burns if safety precau-
tions are not observed.
ELECTRICAL SHOCK
•DO NOT operate this instrument without a properly grounded, properly
polarized power cord. Electric shock may result.
3
1 Before You Start
Safety Information

•DO NOT connect this instrument to a non-grounded, non-polarized out-
let. Ensure the earth ground to the outlet is properly connected. Electrical
shock may result if the outlet is not installed correctly.
•Always replace the power cord with an approved cord of the correct rat-
ing and type.
•HIGH VOLTAGE is used in the operation of this equipment. SEVERE
INJURY or DEATH may result if personnel fail to observe safety precau-
tions. Before working inside the equipment, turn power off and discon-
nect power cord.
•If supplied with user accessible fuses, always replace the fuse with one of
the same rating, voltage and type.
1.2.2 Cautions
•Always operate this instrument at room temperature between 41°F and
122°F (5°C to 50°C). Allow sufficient air circulation by leaving at least 6
inches (15 cm) of clearance around the instrument.
•Component lifetime can be shortened by continuous high temperature op-
eration.
•DO NOT use fluids to clean out the well.
•Never introduce any foreign material into the probe hole of the insert.
Fluids, etc. can leak into the instrument causing damage.
•DO NOT change the values of the calibration constants from the factory
set values. The correct setting of these parameters is important to the
safety and proper operation of the calibrator.
•DO NOT drop the probe sheath in to the well. This type of action can
cause a shock to the sensor and affect the calibration.
•The instrument and any thermometer probes used with it are sensitive in-
struments that can be easily damaged. Always handle these devices with
care. DO NOT allow them to be dropped, struck, stressed, or overheated.
•The Factory Reset Sequence (see Section 12, Troubleshooting) should be
performed only by authorized personnel if no other action is successful in
correcting a malfunction. You must have a copy of the most recent Report
of Calibration to restore the calibration parameters.
•DO NOT operate this instrument in an excessively wet, oily, dusty, or
dirty environment. Always keep the well and inserts clean and clear of
foreign material.
•The dry-well is a precision instrument. Although it has been designed for
optimum durability and trouble free operation, it must be handled with
care. Always carry the instrument in an upright position to prevent the
probe sleeves from dropping out.
•If a mains supply power fluctuation occurs, immediately turn off the in-
strument. Power bumps from brown-outs could damage the instrument.
Wait until the power has stabilized before re-energizing the instrument.
9100S Dry-well Calibrator
User’s Guide
4

•The prop stand was not designed to be used as a handle for carrying the
instrument. To avoid damage, do not force the prop stand beyond the in-
cline positions of the instrument.
•Allow for probe expansion inside the well as the block heats.
•Most probes have handle temperature limits. Be sure that the probe handle
temperature limit is not exceeded in the air above the instrument.
1.3 Authorized Service Centers
Please contact one of the following authorized Service Centers to coordinate
service on your Hart product:
Fluke Corporation, Hart Scientific Division
799 E. Utah Valley Drive
American Fork, UT 84003-9775
USA
Phone: [phone]
Telefax: +1.801.763.1010
E-mail: [email protected]
Fluke Nederland B.V.
Customer Support Services
Science Park Eindhoven 5108
5692 EC Son
NETHERLANDS
Phone: [phone]
Telefax: [phone]
E-mail: [email protected]
Fluke Int'l Corporation
Service Center - Instrimpex
Room 2301 Sciteck Tower
22 Jianguomenwai Dajie
Chao Yang District
Beijing 100004, PRC
CHINA
5
1 Before You Start
Authorized Service Centers

Phone: [phone]
Telefax: [phone]
E-mail: [email protected]
Fluke South East Asia Pte Ltd.
Fluke ASEAN Regional Office
Service Center
60 Alexandra Terrace #03-16
The Comtech (Lobby D)
118502
SINGAPORE
Phone: [phone]
Telefax: [phone]
E-mail: [email protected]
When contacting these Service Centers for support, please have the following
information available:
•Model Number
•Serial Number
•Voltage
•Complete description of the problem
9100S Dry-well Calibrator
User’s Guide
6

2 Introduction
The Hart Scientific 9100S Mid-Range Field Calibrator may be used as a porta-
ble instrument or bench top temperature calibrator for calibrating thermocouple
and RTD temperature probes. This instrument is small enough to use in the
field, and accurate enough to use in the lab. Calibrations may be done over a
range of 35°C to 375°C (95°F to 707°F). Temperature display and setability
resolution is 0.1 degrees.
The instrument features:
•Rapid heating and cooling
•Prop stand
•RS-232 interface capability
Built in programmable features include:
•Temperature scan rate control
•Eight set-point memory
•Adjustable readout in °C or °F
The temperature is accurately controlled by Hart’s digital controller. The con-
troller uses a precision platinum RTD as a sensor and controls the well temper-
ature with a triac driven heater.
The LED front panel continuously shows the current well temperature. The
temperature may be set, using the control buttons, to any desired temperature
within the instrument's range. Multiple fault protection devices insure user and
instrument safety and protection.
This dry-well calibrator was designed for portability, low cost, and ease of op-
eration. Through proper use, the instrument will provide continuous accurate
calibration of temperature sensors and devices. The user should be familiar
with the safety guidelines and operating procedures of the calibrator as de-
scribed in the instruction manual.
7
2 Introduction

3 Specifications and Environmental
Conditions
3.1 Specifications
Range 35°C to 375°C (95°F to 707°F)
Accuracy ±0.25°C at 50°C
±0.25°C at 100°C
±0.5°C at 375°C
Stability ±0.07°C at 50°C
±0.1°C at 100°C
±0.3°C at 375°C
Resolution 0.1°C or °F
Well-to-Well Uniformity ±0.2°C with sensors of similar size at equal depths within wells
Heating Times 35 to 375°C: 9.5 minutes
Stabilization 5 minutes
Cooling Times 375 to 100°C: 14 minutes
Well Depth 4 inches (102 mm)
1/16 inch (1.6 mm) hole is 3.5 inches (89 mm) deep
Fixed Block Options See Section 5.4, Constant Temperature Block Assembly, on page 16 and Fig-
ure 4 on page 16
Power 115 VAC (±10%), 55–65 Hz, 1.5 A or 230 VAC (±10%), 0.8 A, 45–55 Hz, 175 W
Size 2.25" H x 4.9" W x 6.1"D
(57 mm x 125 mm x 150 mm)
Weight 2lb.3oz. (1.08Kg)
Safety Conforms to EN61010-1
Conforms to CAN/CSA C22.2 No.1010.1
UL3111 and ANSI/ISA-S82.01
Fault Protection Sensor burnout protection, over-temperature cutout, and electrical fuses
Fuse Rating 250 V 3 A FF (very fast acting) NO USER SERVICEABLE PARTS
3.2 Environmental Conditions
Although the instrument has been designed for optimum durability and trou-
ble-free operation, it must be handled with care. The instrument should not be
operated in an excessively dusty or dirty environment. Maintenance and clean-
ing recommendations can be found in the Maintenance Section of this manual.
The instrument operates safely under the following conditions:
•temperature range: 5–50°C (41–122°F)
9
3 Specifications and Environmental Conditions
Specifications

•ambient relative humidity: 15–50%
•pressure: 75kPa–106kPa
•mains voltage within ±10% of nominal
•vibrations in the calibration environment should be minimized
•altitudes less than 2000 meters
•indoor use only
3.3 Warranty
Fluke Corporation, Hart Scientific Division (Hart) warrants this product to be
free from defects in material and workmanship under normal use and service
for a period as stated in our current product catalog from the date of shipment.
This warranty extends only to the original purchaser and shall not apply to any
product which, in Hart’s sole opinion, has been subject to misuse, alteration,
abuse or abnormal conditions of operation or handling.
Software is warranted to operate in accordance with its programmed instruc-
tions on appropriate Hart products. It is not warranted to be error free.
Hart’s obligation under this warranty is limited to repair or replacement of a
product which is returned to Hart within the warranty period and is determined,
upon examination by Hart, to be defective. If Hart determines that the defect or
malfunction has been caused by misuse, alteration, abuse or abnormal condi-
tions or operation or handling, Hart will repair the product and bill the pur-
chaser for the reasonable cost of repair.
To exercise this warranty, the purchaser must forward the product after calling
or writing a Hart Scientific Authorized Service Center (see Section 1.3). The
Service Center assumes NO risk for in-transit damage.
THE FOREGOING WARRANTY IS PURCHASER’S SOLE AND EXCLU-
SIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EX-
PRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY
IMPLIED WARRANTY OR MERCHANTABILITY, OR FITNESS FOR ANY
PARTICULAR PURPOSE OR USE. HART SHALL NOT BE LIABLE FOR
ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAM-
AGES OR LOSS WHETHER IN CONTRACT, TORT, OR OTHERWISE.
9100S Dry-well Calibrator
User’s Guide
10

4 Quick Start
4.1 Unpacking
Unpack the dry-well carefully and inspect it for any damage that may have oc-
curred during shipment. If there is shipping damage, notify the carrier
immediately.
Verify that the following components are present:
•9100S Dry-well
•Power Cord
•User's Guide with Report of Calibration
•RS-232 Cable
•9930 Interface-it Software and User's Guide
4.2 Set-up
Place the calibrator on a flat surface with at least 6 inches of free space around
the instrument. Always leave enough clearance in front of the instrument to al-
low for safe and easy insertion and removal of probes. The prop stand may be
swung down to raise the front of the instrument from a horizontal position.
Plug the power cord into a grounded mains outlet. Observe that the nominal
voltage corresponds to that indicated on the calibrator.
Turn on the power to the calibrator by toggling the power switch on. The fan
should begin quietly blowing air through the instrument and the controller dis-
play should illuminate after 3 seconds. After a brief self-test the controller
should begin normal operation. If the unit fails to operate please check the
power connection.
The display should show the well temperature and the well heater will bring the
temperature of the well to the set-point temperature.
After using the calibrator, allow the well to cool by setting the temperature to
25°C and waiting 1/2 hour before turning the instrument off.
4.3 Power
Plug the instrument power cord into a mains outlet of the proper voltage, fre-
quency, and current capability. Refer to Section 3.1, Specifications, for the
power details. Turn the instrument on using the switch on the rear panel. The
instrument will turn on and begin to heat to the previously programmed tem-
perature set-point. The front panel LED display will indicate the actual instru-
ment temperature.
11
4 Quick Start
Unpacking

4.4 Setting the Temperature
Section 7.2 explains in detail how to set the temperature set-point on the cali-
brator using the front panel keys. The procedure is summarized here.
(1) Press “SET” twice to access the set-point value.
(2) Press uor darrow to change the set-point value.
(3) Press “SET” to program in the new set-point.
(4) Press and hold “EXIT” to return to the temperature display.
When the set-point temperature is changed the controller switches the well
heater on or off to raise or lower the temperature. The displayed well tempera-
ture gradually changes until it reaches the set-point temperature. The well may
require 5 to 10 minutes to reach the set-point depending on the span. Another 5
to 10 minutes is required to stabilize within ±0.1°C of the set-point. Ultimate
stability may take 15 to 20 minutes more of stabilization time.
9100S Dry-well Calibrator
User’s Guide
12

5 Parts and Controls
The user should become familiar with the dry-well calibrator and its parts: (See
Figures 1, 2, and 3).
5.1 Rear Panel
Power Cord - The removable power cord, (Figure 1) attaches to the back side
of the instrument. It plugs into a standard 115 VAC (optional 230 VAC)
grounded socket.
Power Switch - The power switch is located on the back panel of the instru-
ment. The switch is either on or off. The on position is for normal operation.
The off position disconnects power to the entire unit.
Fan - The fan inside the instrument runs continuously when the unit is being
operated to provide cooling to the instrument. The fan has two speeds, a slow
speed for control operation and a faster speed for rapid cooling. Slots at the top
and around the corners of the instrument are provided for airflow. The area
around the calibrator must be kept clear to allow adequate ventilation. The air is
13
5 Parts and Controls
Rear Panel
Figure 1 Back Panel

directed from the back to the front and may be hot. Allow 6 inches of open
space around the calibrator to allow adequate ventilation.
RS-232 - The RS-232 serial port provides a means for connecting the instru-
ment to a computer or a printer using the included serial cable.
WARNING: Always leave enough clearance in front of the calibrator to
allow for safe and easy installation and removal of probes.
5.2 Side View
Prop Stand - The prop stand (Figure 2) is located on the bottom side of the in-
strument and lays flat against the bottom of the instrument when not in use.
The prop stand can be swung down into a standing position when using the in-
strument at an inclined position.
9100S Dry-well Calibrator
User’s Guide
14
Figure 2 Side View of the 9100S Showing the Prop Stand