Microelectric Actuators - Two Position

microelectic valve actuator
Two position microelectric actuator with Cheminert HPLC injector
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  • CE-certified
  • Automatic alignment with stall-sensing circuitry - no mechanical microswitches
  • Manual control or remote control via contact closures or TTL logic level signals
  • RS-232 bidirectional communication (optional RS-485)
  • High speed switching - < 100 ms in EQ model

Exclusive stall-sensing circuitry eliminates problems associated with valve/actuator misalignment. Power to the actuator motor is switched off when the driver pin goes against the stop of the valve cutout - no sooner, no later - and it's all done without any mechanical microswitches. Not only are alignment problems are a thing of the past, you can stock one actuator model for valves that turn 30°, 36°, 45°, 60°, 90°, or anything in between.

During initialization, the valve rotates at moderate speed while the actuator waits to sense the stall. Once the rotation angle has been measured and confirmed by repetition, the angle is memorized and actuation takes place at maximum speed. Valve position memory is maintained even in the event of a power failure.

table of actuator torque-speed
Graph for determining actuator model required
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Some valves are harder or easier than others to rotate, so we offer five microelectric models with a range of torque specs. As the figure at right illustrates, actuator speed and torque are inversely proportional. WHICH MODEL DO I NEED? link

Select an item below to view product numbers:

Actuator models

EQ - highest speed
EH - high speed
EP - medium torque
ED - high torque
ET - highest torque

Cables

RS-232 interface
Multidrop (control multiple actuators)
Plug and play

Highest speed two position actuators - Model EQ

Standard voltage 24 VDC. Autosensing 24 VDC power supply is included.

Mounting hardware Product No.
closemount EQ
2" standoff EQ2
3" standoff EQ3
4" standoff EQ4
6" standoff EQ6
for use w/existing standoff EQS

High speed two position actuators - Model EH

Standard voltage 24 VDC. Autosensing 24 VDC power supply is included.

Mounting hardware Product No.
closemount EH
2" standoff EH2
3" standoff EH3
4" standoff EH4
6" standoff EH6
for use w/existing standoff EHS

Medium torque two position actuators - Model EP

Standard voltage 24 VDC. Autosensing 24 VDC power supply is included.

Mounting hardware Product No.
closemount EP
2" standoff EP2
3" standoff EP3
4" standoff EP4
6" standoff EP6
for use w/existing standoff EPS

High torque two position actuators - Model ED

Standard voltage 24 VDC. Autosensing 24 VDC power supply is included.

Mounting hardware Product No.
closemount ED
2" standoff ED2
3" standoff ED3
4" standoff ED4
6" standoff ED6
for use w/existing standoff EDS

Highest torque two position actuators - Model ET

Standard voltage 24 VDC. Autosensing 24 VDC power supply is included.

Mounting hardware Product No.
closemount ET
2" standoff ET2
3" standoff ET3
4" standoff ET4
6" standoff ET6
for use w/existing standoff ETS

RS-232 interface cable

An RS-232 cable is required for controlling an actuator from a computer serial port.

Description Product No.
RS-232 interface cable I-22697

Multi-drop cables

Multi-drop cables permit a single serial port to control multiple microelectric two position and multiposition actuators. Multi-drop cables have one female DB9 connector and 2 to 8 male DB9 connectors and are approximately 6" long.

Note: An RS-232 interface cable (I-22697) is required for each actuator controlled serially.

No. of actuators
to be controlled
Product No.
2 I-22897-02
3 I-22897-03
4 I-22897-04
5 I-22897-05
6 I-22897-06
8 I-22897-08

Plug-and-play cables

Plug-and-play cables will allow a direct connection and control between a specific instrument and a two position microelectric actuator. Contact technical support for cables for other instruments.

Instrument Product No.
Agilent 6890 GC V-RA-24VDC-HP6890
Agilent 7890 GC V-RA-24VDC-HP6890
Varian 3800 GC V-RA-24VDC-VA3800
Agilent 1100 LC V-RA-5VDC-HP1100
Waters Alliance LC V-RA-5VDC-WA2690

MORE INFORMATION

CE COMPLIANCE

TECH TIP

Multi-drop cables permit a single serial port (RS-232) to control multiple actuators.

  • Drawing link
    Serial control of multiple actuators with a multi-drop cable
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MOUNTING HARDWARE

In the product number tables on this page, an actuator can be specified with closemount hardware, with a standoff (2", 3", 4", or 6"), or with just the standoff mounting hardware, if your valve already has a standoff.

Valves which will be mounted in ovens require a standoff assembly, which locates the actuator out of the heated zone.