Models 31 and 34, Precision Miniature load cells measure both tension and compression load
forces of 50 grams to 10,000 lb. These models are our highest accuracy, rugged miniature
load cells. Model 31’s welded, stainless steel construction is designed to eliminate or reduce
to a minimum, the effects of off-axis loads. (The internal construction assures excellent long
term stability for ranges 1000 grams and above.) A modification permits this model to be
completely welded for underwater applications. The Model 31 tension/compression load cell
has male threads while the Model 34 tension/compression load cell has female threaded load
attachments. High accuracies of 0.15-0.25% full scale are achieved. Each bonded strain gage
unit is built of welded 17-4 PH stainless steel for additional ruggedness. All load cells that
have ranges 10 lb. have a small electrical zero balance circuit board which is in the lead
wire (approximately 1"x .087" thick). This balance board does not have to be the same tem-
perature as the transducer. Applications include cable tension and electromechanical parts
testing.
Precision Miniature Load
Cells
Model 31 and 34
WELDED STAINLESS
LO-18
Dimensions (inches)
* Stocked ranges are in bold face print.
Notes: Model 31 load cells <250 grams have overload stops. For custom cells without overload stops con-
sult SENSOTEC.
RUGGED, SMALL SIZE
TENSION/COMPRESSION
Model 34 (Order Code AL312)
Available Ranges D” H” A” B” M” N”
50; 150; 250; 500 g. 1.00 1.75 0.52 0.52 0.38 0.50
1,000 g.; 5; 10 lb. 0.75 1.75 0.60 0.72 0.19 0.31
25; 50; 100 lb. 1.00 1.75 0.52 0.72 0.25 0.50
250; 500; 1,000 lb. 1.00 2.00 0.75 0.75 0.25 0.50
Model 31 (Order Code AL311)
Available Ranges* T D” H” C” F” A” B”
Thread
50; 150; 250 500; g. #6-32 UNC 1.00 0.75 0.25 0.11 0.50 0.38
1,000 g.; 5; 10 lb. #6-32 UNC 0.75 0.45 0.25 0.05 0.31 0.19
25; 50; 100 lb. #10-32 UNF 1.00 0.52 0.25 0.03 0.50 0.25
250; 500; 1,000 lb. 1/4-28 UNF 1.00 0.52 0.38 0.03 0.50 0.25
2,000; 3,000 lb. 3/8-24 UNF 1.00 0.72 0.50 0.03 0.50 0.38
4,000; 5,000 lb. 1/2-20 UNF 1.25 0.94 0.63 0.03 0.50 0.38
7,500; 10,000 lb. 3/4-16 UNF 1.38 1.10 0.88 0.03 0.50 0.38
Model 34
(Tension/Compression)
Model 34 Female Threads
(Tension/Compression)
Model 31 Male Threads
(Tension/Compression)
Model 31
(Tension/Compression)
Sensotec Sensors
General Information
LO-19
Options (See Appendix)
Temperature compensated 1b, 1c, 1f; Special calibration 30a, 30b
Premium Options: 1d, 1e, 1g, 1h (</=25 lb), 1i; 6d; 9a (</=5 lb.)
Accessories: Rod end attachments for Model 31
How to order (See Pg. AP-19)
Load cell selection flow chart (See Pg. LO-1)
Installation Note: Maximum torque for installation of Model 31 in ranges less than 25 lb. is 12 lb.-in.
Load Ranges................................
Non-Linearity/Hysteresis (max)
50 to 1,000 g ............................
5 to 250 lb. ...............................
500 to 10,000 lb. ......................
Non-Repeatability (max)
50 to 1,000 g ............................
5 to 10,000 lb. ..........................
Output (standard)
50 to 150 g (semi) ....................
250 to 500 g (semi) ..................
1,000 g .....................................
5 lb. to 10,000 lb. (foil) .............
Resolution ....................................
Temperature, Operating...............
Temperature, Compensated ........
Temperature Effect
– Zero/Span (max)
50 to 500 g ...............................
1,000 g .....................................
5 to 10,000 lb. ..........................
Strain Gage Type .........................
Excitation (Calibration)
50 g to 10 lb. ............................
20 lb. to 10,000 lb. ...................
Insulation Resistance ...................
Bridge Resistance
50 to 500 g ...............................
1,000 gms.................................
5 to 10,000 lb. ..........................
Shunt Calibration Data .................
Wiring Code (std) .........................
Electrical Termination (std) ..........
Overload, Safe .............................
Thread Size..................................
Deflection – Full Scale .................
Casing material ............................
Weight (nom)................................
Outputs Available .........................
Model 31
(Male Threads)
(Tension/Compression)
Order Code AL311
50 g to 10,000 lb.
±0.15% F.S.
±0.15% F.S.
±0.2% F.S.
±0.1% F.S.
±0.05% F.S.
0.1mV/V/g max
20mV/V
1.5mV/V (nominal)
2mV/V
Infinite
-65° F to 250° F
60° F to 160° F
0.015% F.S./ ° F
0.005% F.S./ ° F
0.005% F.S./ ° F
Foil or Semiconductor
5.00VDC
10.0VDC
5000 megohm @ 50VDC
500 ohms (semi)
350 ohms (foil)
350 ohms (foil)
Included
#1 (See Pg. AP-8)
Teflon cable (5 ft.)
50% over capacity
See table
0.0005"-0.0020"
17-4 PH Stainless
1.6 oz.
±5VDC, 4-20mA
Model 34
(Female Threads)
(Tension/Compression)
Order Code AL312
50 g to 1,000 lb.
±0.15% F.S.
±0.15% F.S.
±0.2% F.S.
±0.1% F.S.
±0.05% F.S.
0.1mV/V/g
20mV/V
1.5mV/V (nom)
2mV/V
Infinite
-65° F to 250° F
60° F to 160° F
0.015% F.S./ ° F
0.005% F.S./ ° F
0.005% F.S./ ° F
Foil or Semiconductor
5.00VDC
10.0VDC
5000 megohm @ 50VDC
500 ohms (semi)
350 ohms (foil)
350 ohms (foil)
Included
#1 (See Pg. AP-8)
Teflon cable (5 ft.)
50% over capacity
See table
0.0005"-0.0020"
17-4 PH Stainless
2.5 oz.
±5VDC, 4-20mA
PERFORMANCE
ENVIRONMENTAL
ELECTRICAL
MECHANICAL
IN-LINE AMPLIFIERS
(Optional)
NOTES *Standard calibration for tension/compression load cells is in tension only.
1-888-282-9891
