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MICROCOPY RESOLUTION TEST CHART
NATIONAL BUREAU OF STANDARDS -1963
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LEGAL NOTICE
This report was prepared as an account of
Government sponsored work. Neither the
United States, nor the Commission, nor any
person acting on behalf of the Commission:
A. Makes any warranty or representa-
tion, expressed or implied, with respect to
the accuracy, completeness, or usefulness
of the information contained in this report,
or that the use of any information, appa-
ratus, method, or process disclosed in this
report may not infringe privately owned
rights; or
B. Assumes any liabilities with respect
to the use of, or for damages resulting from
the use of any information, apparatus,
method, or process disclosed in this report.
As used in the above, "person acting on
behalf of the Commission” includes any em-
ployee or contractor of the Commission, or
employee of such contractor, to the extent
that such employee or contractor of the
Commission, or employee of such contractor
prepares, disseminates, or provides access
to any information pursuant to his employ-
ment or contract with the Commission, or
his employment with such contractor.
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ORNL. P. 1533
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ORNI - AEC - OFFICIAL
سحخمسهسننمممهمند: نواندنی
0::sini
SEP 1 6 1965
MASTER
معدن
معمہ
mi
ANALYTICAL LABOR. TORY HOT-CELL EQUIPMENT:
II. A REMOTELY CONTROL. ED CORROSION RESISTANT PIPETTER
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Hitrit
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W. L. Maddox, F. H. Haga, ** and D. J. Fisher
twintinu ar
Analytical Chemistry Division
Oak Ridge National Laboratory
Post Office Box X
Oak Ridre, Tennessee 37831
RELEASED FOR ANNOLRICEMENT
IN NUCLEAK SCIENCE ABSTRACI'S
*Research sponsored by the U. S. Atomic Energy Commission under contract
with the Union Carbide Corporation.
OANI - AEC - OFFICIAL
ORNI - AEC - OFFICIAL
**Present Address: Southern Railway Co., 25 Spring St., Atlanta, Georgia.
Chiii.deC - 018!cini
Remotely controlled serve pipetters, designed at ORNL in the early 1950's,
have under,sone a series of revisions, the most important of which was the
ORNL - AEC - OFFICIAL
introduction of construction materials having a high degree of resistance
to chemical attack into the parts which contact the liquids being pipetted;
the construction cost was also lowered through design improvements. The early
work on these pipetters and the tests made with corrosion-resistant pipets
.
have been clescribed at the Gatlinburg conferences on Analytical Chemistry in
Nuclear Reactor Technology(1,2). This paper describes the latest model, Q-13480,
which was developed from the earlier designs in order to meet increasingly
stringent requirements for remote maintenance.
CONSTRUCTION
The pi pet consists of a high quality syringe having a carefully ground non-
porous Graphitar grade 14" plunger and a high-density, virgin grade Teflon liner
contained within an aluminum shell which can be adjusted to compress and
contain the upper part of the Teflon liner into a defined dynamic seal
against the plunger. A Fluorothene side arm, which permits complete filling
of the liner with liquid and provides for remote cleaning, and a slender,
Fluorothene delivery tip complete the pipet proper.
The pipet is attached to a driving position servo mechanism (1) to form
the remote unit. This is mounted on a simple stand as shown in Fig. 2. Con-
nection between the remote unit and the control unit outside the cell 18.
made by a single electrical cable.
: PRINCIPLE OF OPERATION
The volume of liquid which is displaced from the delivery "it by motion
of the plunger into the completely filled liner is known from the dimensions
of the plunger, whose position is controlled by the position servomechanism.
The command potentiometer of the servomechanism is set with a digital dial
on the control unit. This potentiometer and a similar potentiometer which is
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2
5.
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an sedan tidigare etter toute statimia
geared to the plunger-driving servo motor on the remote unit (Fig. 1) are
arms of a bridge at the servo mplifier's input. The bridge is balanced
when the servo motor drives the remote potentiometer wiper to electrical
ORNI - AEC - OFFICIAL
equality with the command pote.itiometer wiper.
m
ACCURACY AND PRECISION
A triruning adjustment is provided so that the digital dial can be made
to read exect volumes deliverer? to the nearest microliter. The total
volume delivered can be readily adjusted to within 0.1% by weighing water
delivered in l-ml portions.
The precision of repetitire deliveries of 0.100-ml increments over the
full range of plunger travel hus been determined by delivering samples of
concentrated nitric acid and ti trating these with a standard sodium hydroxide
solution. The titrimetric procedure is inherently capable of about 0.2%
!
precision; the relative standard deviation of series of 0.100-ml samples has
been 0.2% or less on groups of 14 to 20 samples.
REMOTE USE
bidamini oldini oltaischichiblandt andet som
The Q-1348C pipetter is designed to deliver 0.1 ml to 1.0 ml portions
of liquids which may contain acids, bases, or oxidants12,5); When the samples
are also intensely radioactive, or when trace cross contamination between .
samples must be prevented, a secondary displacement fluid should be used.
Amsco, dyed so as to make the line between the aqueous and organic layers
distinctly visible, is one such fluid. For this use a short, pointed adapter
(as shown in Fig. 1) 18 used with i transparent disposable tip 6). The
secondary fluid fills the pipet and greatly reduces radiation damage to the
Teflon liner. Since the sample is in contact only with the tip and the tip
can be discarded after one sample is delivered, trace cross-contamination
between samples which are to be used for radiochemical analyses is prevented.
We have reason to have confidence in the durability of the instrument.
Several servo driving mechanisms of models Q-1348 and Q-1348A pipetters
ORNI - AEC - OFFICIAL
.
ORNI - AEC - OFFICIAL
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have endured years of service in the corrosive atmosphere of anuJ.ytical hot
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ORNI - AIC - OFFICIAL
cells without appreciable detecioration of their performance and with only
a reasonable amount of contact maintenance. Unfortunately, when repairs or
routinc replacements were required it was necessary to enter the cells and
dismantle the remote units by hand. Also, tests have shown that the corrosion-
resistant pipet will function reliably for thousands of pipettings of corrosive
samples without reti.ghtening the dynamic-se al compression caps").
With the increase both in numbers and activity levels of samples coming
into our high-level analytical facilities, it became necessary to design a
unit suitable for immediate and simple remote replacemenů of the motor, the
pipet assembly, or the complete remote unit. In our Transuranium Processing
Plant; this requires that the pieces be of a size to fit into a cylindrical
container 8 inches in diameter by 8 inches deep.
An interesting feature of the 2-138C design 18 the single, large electrical
connector. A size 28 Amphenol connector is much easier to disconnect with
model 8 manipulators than are the smaller sizes; when all have been subjected
to accelerated corrosion of several days' duration. This is true when the
threaded connector rings are screwed on tightly and then backed off about
1/10 turn et assembly--not enough back-off to cause any looseness of the
connection.
·
The remote unit is not attached rigidly to its stand, but is secured
.
against accidentally being lifted off by an Allen wrench that fits loosely in
i
a hole drilled through the mounting socket and into the stand (Fig. 2). This
provides a handy place to store the wrench, which can be easily removed and
utilized with master-slave manipulatu 's when it becomes necessary to remove
either the motor or the pipet. With care, a motor or a pipet can be replaced
without disturbing the alignment of the remote unit. Normal fabrication
ORNI - AEC - OFFICIAL
ORNI - AEC - OFFICIAL
tolerances require that the pipetter be recalibrated by means of the trimming
adjustment if a plunger is replaced.

ORNI - AIC - OFFICIAL
Complete mechanical(+) and electrical drawings are available for
the pipetter. A method, describing its construction, use, and maintenance in
detail has been issued as a part of the ORNL Master Analytical Manual).
ORNI - AEC - OFFICIAL
ORNI - AEC - OFFICIAL
ORNI - AEC - OFFICIAL
ACKI:OWLEDGEMENT
TY131330-334-:.
30
We are p.leased to acknowledge assistance we received from C. C. Courtney,
.
G. B. Child, and R. H. Miles during design and fabrication of the Q-13480
pipetter.
ORNI - ARC - OFFICIAL
ORNI - AEC - OFFICIAL
References
ORNL - 1.[C-OFFICIAL
ORNI - AIC - OFFICIAL
1. M. T. Kelley, H. L. Hemphill, and D. J. Fisher, "Servo-controlled Pipetter
for Prı:cise Delivery of Mi'roliter Drops," pp. 98-105, Analytical Chemistry
in Nuc..ear Reactor Techno.) 2y — TID-7568 (part 2), Office of Tech.
Services, Dept. of Commer:?, Washington, D.C., April 1959,
2. D. J. jisher, M. T. Kelley, and W. L. Belew, "A Corrosion-Resistant
Pipetter for Remote Measurement of Radioactive Samples," pp. 311-329,
Analytical Chemistry in Nurlear Reactor Technology - TID-7606, Office
of Tech. Services, Dept. of Commerce, Washington, D.C., (1961).
3. United States Graphite Com.wany, Saginaw, Mich. Engineering Hand bouk GT-64.
_
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4. ORNL General Engineering & Construction Division Dwgs. M-11059-EF-001,
-002, -003, -006, -007.
5. ORNL Instrumentation & Controls Division Dwgs. Q-1348C series.
.
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6.
-... **
F. E. llaga and D. J. Fishe :", "Pipetters, Remotely Servo-controlled,
Corrosion Resistant, ORNL lodels Q-1348A, Q-1348B, and Q-13480," Method
Nos. 1 003102 and 9 003102 (3-26-65), ORNL Master Analytical Manual,
Pupplerent 8 of TI 2-7015, Clearinghouse Tor Todorel Bolontı:ic and
Technical Int'ormation, National Bureau of Standards, U. S. Department
of Commerce, Springfield, Va.
ORNI - AEC - OFFICIAL
ORNI - AEC - OFFICIAL
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END

DATE FILMED
10/ 15/65
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