REED RELAYS FOR DATA AQUISITION

In Data Acquisition (DAQ) applications, measurements need to be taken from a wide range of transducers and sensors, usually to be converted to digital information which is then suitable to be used by computer software or PLCs. For example, where thermocouples are used for temperature measurement or monitoring. These signals can be very low and reed relays are often the best choice to switch between the sensors and the data acquisition instruments.

It is important to have low and stable contact resistances and very low thermal offset voltages helping to mitigate any unacceptable errors that can be introduced when switching very low signal levels. Along with very low leakage currents and capacitance when compared to semiconductors, and hermetically sealed contact surfaces protected from oxidization when compared to electromechanical relays, all of these can be key factors for accurate measurements.

The Pickering Series 100 and 101 have very low thermal EMF performance, use instrument grade reed switches very low leakage currents making them the ideal choice in these sometimes demanding DAQ applications.

Recommended Reed Relays for Data Acquisition

Series 100 – Low Thermal EMF

Thermal EMF about 1 Microvolt or Less. 1 Form A, 2 Form A, 1 Form B & 1 Form C configurations. 3, 5, 12 or 24 V coils. Low power consumption, ideal for portable equipment.

The Pickering Series 100 reed relays are primarily intended for direct drive from 4000B CMOS or NMOS logic or similar low current sources, as well as data acquisition, or thermocouple switching. They are also useful for applications where conservation of current is important, for example, battery powered equipment.

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Series 101 – Low Capacitance

High coil resistances up to 6000 Ω. Form A (energise to make), Form B (energise to break) & 1 Form C changeover configurations. 3, 5, 12 or 24 V coils. Direct drive from 74HC or HCT.

Series 101 stacks on 0.3 inches pitch. 74HC or HCT logic without the need for additional drivers – spacing PCB space. 74HC logic will drive up to 4mA at 5 Volts. 101-1-A-5/17D has the advantage of a lower level of thermal EMF of 3 microvolts or less. 1 Form A, 5V versions are ideal for battery powered portable equipment due to a coil current of only 1.7 mA.

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Shop Reed Relays for Data Acquisition

The below table will help you narrow down our offering to get you the correct reed relay for your application.

Once you narrow your selections down you can download a reed relay data sheet for more information or request a quote to find out prices and lead times.

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Contact Configuration
Switching Current (Amps)
Switching Power (Watts)
Switching Voltage (DC or AC peak)
Stand-off Voltage (DC or AC peak)
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Coil Resistance (Ω)
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1 Form A - SPST N.O.
1
Amps
20
200
240
24V
6000 Ω
General Dry Reed
No
7.4
20.1
9.4
0 - MTO
$10.01
1 Form C - SPDT Changeover
0.25
Amps
3
200
200
12V
6000 Ω
Changeover
No
7.4
20.1
9.4
0 - MTO
$13.87
1 Form A - SPST N.O.
0.5
Amps
10
400
440
5V
1600 Ω
High Voltage Reed
Yes
7.4
20.1
9.4
0 - MTO
$13.35
2 Form A - DPST N.O.
1
Amps
20
200
240
12V
3000 Ω
General Dry Reed
Yes
7.4
20.1
9.4
15
$12.36
Max: 15
Min: 1
Step: 1
Add
1 Form A - SPST N.O.
2
Amps
50
500
550
24V
3000 Ω
Std Mercury Reed
No
7.4
20.1
9.4
0 - MTO
$60.67
2 Form A - DPST N.O.
0.5
Amps
10
200
240
24V
6000 Ω
Low Level Dry Reed
No
7.4
20.1
12.5
0 - MTO
$12.68
1 Form A - SPST N.O.
0.5
Amps
10
200
240
3V
1600 Ω
Low Level Dry Reed
Yes
7.4
20.1
9.4
110
$9.01
Max: 110
Min: 1
Step: 1
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1 2 19