Adept Rocketry

ES231 Series Low Current / High Current Electronic Stagerô with Memory

ST231 Series Current / High Current Timer with Memory

Copyright © 2000-2003, All Rights Reserved

DESCRIPTION

The ES231/ST231 Series Stager/Timer is a series of Stagers and Timers that are capable of supplying very high current to igniters or deployment charges. The M in the Model designation stands for Memory. All six of these devices include a nonvolatile memory in which to store the time setting. The value is permanent until it is easily reprogrammed to a different value.

Unlike a Timer, a Stager detects liftoff by first detecting acceleration, and then fires the next stage
when it detects deceleration due to motor burnout. This is especially handy when the exact burn time of the first stage motor is not known, as with a hybrid motor. Also, an amount of coast time may be added before ignition of the next stage. A Stager can also be used to control airstart sequencing of motors.

A Timer arms at the first instant of liftoff and fires after a predetermined period of time. A Timer is used for staging, airstarting motors, or for controlling parachute deployment at a given time after liftoff.

The ES231 Electronic Stagerô and the ST231 Timer are each offered in three different configurations with different current supplying capabilities. The versions capable of high current (designated H or LH) use an external battery to supply up to 12 amps of current for over two seconds, to fire virtually any type of igniters or deployment charges, depending on the type of  load driving battery used, alkaline, nicad, etc. The designation L stands for low current; the device can fire (no external battery needed) flashbulbs or low-current electric matches such as the Daveyfire brand 28B or 28BR electric match. The designation LH stands for low current or high current. When used for just low current the device does not need an external battery. The small on-board battery along with the large electrolytic capacitor are used to fire the charge. When used for high current, an LH device requires use of an external battery. An H device (lowest cost) always requires use of an external battery even if used to fire only a low-current igniter or deployment charge. The external battery voltage range is 4.5 to 12 volts.

A 12-volt lighter battery is used to keep the microprocessor system running glitch free during the times of heavy current demand to the igniter or deployment charge. On the L and LH models, current to a low-current load is actually supplied by the large electrolytic capacitor. The lighter battery is always used, even when an external battery is required.

Times are programmable to values in excess of 10 minutes in increments as fine as 1/100 second. The length of time in which the outputs remain energized is approximately 2.3 seconds. The programmed time setting is stored in a nonvolatile memory, and is not affected when the device is turned off or when the battery is removed. The setting remains indefinitely until it is reprogrammed. Programming and testing is simple and quick.

This device uses Adeptís patented acceleration sensing system for simplicity and to insure safety. If acceleration and movement upward does not continue for at least 0.3 second, the timeout operation will not be enabled. The system cannot be set off accidentally by dropping, shaking, bumping, falling over, etc. With a Stager, time starts at the first moment of deceleration, following a valid liftoff. With a Timer, time starts from the first moment of liftoff.

ES231MH Electronic Stagerô with Memory
Price: $64.00; includes CAB5BC Cable/Battery Clip and GP-23A battery.
Supplies Low Current or High Current. Always requires use of an External Battery.

ES231ML Electronic Stagerô with Memory
Price: $69.00; includes standard CAB5-12 Cable and GP-23A battery.
Supplies only Low Current. External Battery not required.

ES231MLH Electronic Stagerô with Memory
Price: $74.00; includes CAB5BC Cable/Battery Clip and GP-23A battery.
Supplies Low Current or High Current. Requires External Battery only for High Current.

ST231MH Staging / Deployment Timer with Memory
Price: $64.00; includes CAB5BC Cable/Battery Clip and GP-23A battery.
Supplies Low Current or High Current. Always requires use of an External Battery.

ST231ML Staging / Deployment Timer with Memory
Price: $69.00; includes standard CAB5-12 Cable and GP-23A battery.
Supplies only Low Current. External Battery not required.

ST231MLH Staging / Deployment Timer with Memory
Price: $74.00; includes CAB5BC Cable/Battery Clip and GP-23A battery.
Supplies Low Current or High Current. Requires External Battery only for High Current.

N-6PT Rechargeable Nicad Battery with Very High Current Capability; Price: $16.79.

WY-29V Charger for two Nicad Batteries; Price: $14.50.

Additional CAB5BC Cable/Battery Clip Assembly; Price: $5.49.

Additional CAB5-12 (12-inch) Cable; Price: $4.99. CAB5-24 (24-inch) Cable; Price: $6.25. CAB5-36 (36-inch) Cable; Price: $7.29.

Additional GP-23A Alkaline Lighter Battery; Price: $2.25.

SPECIFICATIONS

10-10-03