Crystal Acoustics 24vdc Loop User manual

Operation Manual

Output Terminals:
24 VDC output. Observe correct polarity.
On Key:
Press to turn power on when connected to loop.
Must be connected to a load for On Key to function.
LED signals:
On when loop is powered.

On when batteries are nearing depletion.
To avoid damage to rechargeable batteries, remove
when this LED is illuminated. Refer to the Approximate
Battery Life table on page 2 for battery life estimations.
On when unable to maintain 24V output.
A depleted battery, short circuit, or low loop impedance will
cause this LED to illuminate.
24VDC Loop Power Supply Operation Manual 1
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INTRODUCTION
The 24VDC Loop Power Supply (24VDCPS) is a portable, battery-powered, loop power supply and is ideal for sites where power is unavailable. The low noise
regulated output is suitable for use with smart transmitters. Power is automatically turned o when load is removed, preserving battery life. Outputs feature
short circuit protection. Three LEDs indicate power, low battery, and fault status. A protective boot and two AA batteries are included.
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QUICKSTART/OPERATION DIAGRAM
Auto-O & Power Hold Function
When the loop is connected, press the On key to enable the output voltage. The 24VDCPS does not have an O switch. When testing is complete, simply
disconnect the loop and the unit will turn o automatically. If the loop is re-connected within approximately 30 seconds, the unit will power on automatically.

24VDC Loop Power Supply Operation Manual 2
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BATTERIES
The 24VDCPS uses 2 AA batteries. Recommended batteries are Lithium (non-rechargeable), Alkaline, or NiMH (rechargeable). To avoid damage by over-dis-
charging, rechargeable batteries should be removed when the Low Battery LED ()illuminates. Non-Rechargeable batteries may continue to be used until
the Red Fault LED ()illuminates, at which time the output voltage will have fallen below 24V. Lithium batteries are recommended for best performance in
cold weather operations.
Typical Battery Life (Conditions: 12mA loop current, 23°C)
Battery Chemistry Type Examples Typical Battery Life (hours) Low Battery Indication ()
Lithium Non-Rechargeable Energizer Ultimate 14.5
(10 hrs at -20° C)
2 minutes remaining at 24 V output
5 minutes until output drops below 18 V
Alkaline Non-Rechargeable
Rayovac Max Plus 815
Duracell MN1500
Energizer E91, EN91
630 minutes remaining at 24 V output
40 minutes until output drops below 18 V
NiMH Rechargeable Energizer Recharge 9Remove batteries immediately
NiMH (Low Self Discharge) Rechargeable Sanyo Eneloop 7.5 Remove batteries immediately
!CAUTION: Do not use AA sized, 3.6V Li-Ion batteries in the 24VDCPS. Doing so will damage the device.
Battery Replacement
Remove the protective boot and slide the battery cover o. Replace the batteries, taking care to note the correct polarity.
For best results, always replace batteries in pairs. Do not mix fresh and old batteries or batteries of dierent types.
!CAUTION: To avoid damage by over-discharging, rechargeable batteries should be removed immediately when the Low Battery LED ()illuminates.

24VDC Loop Power Supply Operation Manual 3
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ELECTRICAL SPECIFICATIONS
Output Voltage . . . . . . . . . . . . . . . . . . 24 VDC +/- 2%
Output Voltage Ripple . . . . . . . . . . . < 14 mV rms
Load Regulation . . . . . . . . . . . . . . . . . 1%
Rated Output Current. . . . . . . . . . . . 25 mA
Short Circuit Protection . . . . . . . . . . Continuous
Connections. . . . . . . . . . . . . . . . . . . . . 4mm banana jacks
Operating Temperature . . . . . . . . . . -20 to 50°C (-4 to 122°F)
Storage Temperature . . . . . . . . . . . . -40 to 75°C (-40 to 167°F)
Operating Humidity . . . . . . . . . . . . . 95% Relative, non-condensing
Power Supply. . . . . . . . . . . . . . . . . . . . 2 x AA batteries (alkaline 1.5 V included)
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MECHANICAL SPECIFICATIONS
Overall Dimensions . . . . . . . . . . . . . . 4.8" x 3.1" x 1.2"
Weight . . . . . . . . . . . . . . . . . . . . . . . . . .200 g (0.44 lbs) including alkaline batteries
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ENCLOSURE
Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . IP40
Housing . . . . . . . . . . . . . . . . . . . . . . . . . ABS
Protective Boot . . . . . . . . . . . . . . . . . . Silicone Rubber
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CERTIFICATIONS
The 24VDCPS has been tested and certied to comply with a variety of international standards.
We declare that the 24VDCPS is in accordance with the Electromagnetic Compatibility Directive per our declaration.
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ORDERING INFORMATION
P/N 24VDCPS KIT ...24 VDC Loop Power Supply plus the P/N 1351 Test Lead Set
P/N 24VDCPS.......24 VDC Loop Power Supply
P/N 1351 ...........Test Lead Kit
Two 4 mm shrouded banana plug, straight to right angle, 122 cm (48 inch) leads with alligator clip and spring loaded hook tip probes.

24VDC Loop Power Supply Operation Manual 4
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EMC EC DECLARATION OF CONFORMITY
EC Declaration of Conformity
I/We Crystal Engineering Corporation
of 708 Fiero Lane, Suite 9
San Luis Obispo, CA, 93401
USA
declare that 24VDC Loop Power Supply Series
In accordance with the following directives
has been designed and manufactured to the following specifications
2004/108/EC The Electromagnetic Compatibility Directive per:
EN 55011:2007
EN 61326:2006
ssaPBssalCsnoissimEdetaidaR7002:11055NE
ssaPAairetirCegrahcsiDcitatsortcelE9002:2-4-00016NE
EN 61000-4-3:2006 RF Radiated Immunity Pass
I hereby declare that the equipment named above has been designed to comply with the
relevant sections of the above referenced specifications. The unit complies with all essential
requirements of the Directives
David K. Porter, P.E.
(NAME OF AUTHORIZED PERSON)
Director of Engineering
(TITLE OF AUTH ORIZED PERSON)
24 January 2012
(SIGNATURE OF THE AUTHORIZED PERSON) (DATE OF ISSUE)

24VDC Loop Power Supply Operation Manual 5
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CONTACT US
Phone . . . . . . . . . . . . . . . . . . . . . . . . . . [phone]
Toll-Free . . . . . . . . . . . . . . . . . . . . . . . . [phone]
Fax. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [phone]
Email . . . . . . . . . . . . . . . . . . . . . . . . . . . [e-mail]
Web. . . . . . . . . . . . . . . . . . . . . . . . . . . . . crystalengineering.net
If calling, have ready the model number, serial number, date of purchase, and reason for return. You will receive instructions for returning the device to us.
Send your comments to: [e-mail]
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TRADEMARKS
This manual contains the following third-party trademarks, both registered and unregistered. All marks are the property of their respective companies.
Rayovac® and Maximum Plus™ ......................Rayovac Corporation
Duracell® ...........................................Duracell Inc. Corporation
Energizer®, Energizer Recharge®, and Eveready.......Eveready Battery Company, Inc.
Sanyo Eneloop™ ....................................SANYO Component Europe GmbH
“Pressure is Our Business”is a registered trademark of Crystal Engineering Corp.
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WARRANTY
Crystal Engineering Corporation warrants the 24VDCPS to be free from defects in material and workmanship under normal use and service for one (1) year from
date of purchase to the original purchaser. It does not apply to batteries or when the product has been misused, altered or damaged by accident or abnormal
conditions of operation.
Crystal Engineering will, at our option, repair or replace the defective device free of charge and the device will be returned, transportation prepaid. However, if
we determine the failure was caused by misuse, alteration, accident or abnormal condition of operation, you will be billed for the repair.
CRYSTAL ENGINEERING CORPORATION MAKES NO WARRANTY OTHER THAN THE LIMITED WARRANTY STATED ABOVE. ALL WARRANTIES, INCLUDING IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE, ARE LIMITED TO A PERIOD OF ONE (1) YEAR FROM THE DATE OF PURCHASE.
CRYSTAL ENGINEERING SHALL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT, TORT OR OTHERWISE.
Note: (USA only) Some states do not allow limitations of implied warranties or the exclusion of incidental or consequential damages, so the above limitations
or exclusions may not apply to you. This warranty gives you specic legal rights and you may have other rights which vary from state to state.

4805.B
© 2012 Crystal Engineering Corporation
708 Fiero Lane, Suite 9, San Luis Obispo, California 93401-8701