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DS9108 Concrete Temperature Monitor
www.maxim-ic.com
GENERAL DESCRIPTION
This product is a sealed plastic stick containing three DS1921G iButtons(R). The iButtons are connected in parallel through metal plates that are spot-welded to the IO and GND contact, respectively. Two stranded wires protruding from the top end of the stick allow for a 1-Wire(R) reader/write to make contact to the iButtons for setup and data retrieval. Electrically, the product is specified by the DS1921G data sheet, with the proper scaling (e.g., current x3, capacitance x3). The mechanical and thermal characteristics of the module are specified in this document.
FEATURES
Three DS1921G networked to monitor temperate at the top, bottom and center of the stick Connects to 1-Wire reader/writer through colorcoded 18 AWG (1 mm O) stranded wires with 1/2 inch (1.3 cm) stripped ends Electrically compatible to the DS1921G Thermochron iButton (3 in parallel) Sealed against liquid intrusion Module position information stored in DS1921G memory
APPLICATIONS
Concrete Maturity Monitoring
ORDERING INFORMATION
PART DS9108-8# DS9108-10# DS9108-12# DS9108-15# TEMP RANGE -20C to 65C -20C to 65C -20C to 65C -20C to 65C PIN-PACKAGE 8" (20.3 cm) depth* 10" (25.4 cm) depth 12" (30.5 cm) depth 15" (38.1 cm) depth
Shipped in bulk with the wires bundled with a tie * Indicates depth of concrete to monitor, actual stick length is 0.25" (0.6 cm) less then depth
TYPICAL OPERATING CIRCUIT
VCC RPUP*
BLOCK DIAGRAM
Stranded wire Ends twisted U1 IO
Red wire
Metal plates welded to iButtons U2 U3
Portable 1-Wire reader
Temperature Monitor IO GND Black Red
DS1921G #1 TOP
DS1921G #2 MIDDLE
DS1921G #3 BOTTOM
GND
Black wire
Transition wire to metal plate
* See Application Note 3829 for Rpup resistor size selection. iButton and 1-Wire are registered trademarks of Dallas Semiconductor.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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REV: 102106
DS9108 Concrete Temperature Module
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground Operating Temperature Range Storage Temperature Range See DS1921G Datasheet
-4F to 149F (-20C to +65C)
See DS1921G Datasheet
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device.
SPECIFICATIONS
(See DS1921G datasheet, TA = -4F to 149F (-20C to +65C) (Note 1)) PARAMETER Weight Physical Dimensions Wire Length Tensile Strength of Wires Thermal Response Time (Note 2) CONDITIONS MIN TYP 2.5 72 See technical drawing 12.9 32.8 10 44.5 500 13.1 33.3 inches cm lbf Newton s MAX UNITS ounces grams
Note 1: Assembled module production tested at 77F (25C). Note 2: Response time in water is the time required for the recorded value to read 63% of the temperature's real variation.
Material: PVC with PVC cement and E-60NC black Hysol epoxy for wire sealant
PIN DESCRIPTION
PIN Red Wire Black Wire NAME FUNCTION
IO GND
1-Wire bus interface. Open drain, requires external pull-up resistor. Ground Reference
iButton LOCATION WITHIN MODULE
Each DS1921G in the DS9108 module contains a memory tag marker to indicate its position in the assembly. The position mark is a CRC16 validated packet starting on page 15 in the user memory. The memory image for `TOP', `MIDDLE', and `BOTTOM':
Table 1. Memory Tag Description
TAG TYPE TOP MIDDLE BOTTOM ADDRESS 1E0h-1E3h CONTENTS (HEX) 01 54 FA 60 01 4D 3B AA 01 42 7B AE DESCRIPTION `T' in a CRC validated packet `M' in a CRC validated packet `B' in a CRC validated packet
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DS9108 Concrete Temperature Module
TYPICAL OPERATING CHARACTERISTICS
The module is inserted into wet concrete with the top approximately 0.25 inches (0.6 cm) below the surface. The wires are draped on the surface for later data retrieval.
Concrete Surface
0.25
PACKAGE INFORMATION
0.20 (0.5)
L
0.63 (1.6)
1.10 (2.8)
Bottom iButton
Middle iButton
Top iButton
M B T
Concrete Depth 8 (20.3) 10 (25.4) 12 (30.5) 15 (38.1) Inches (centimeters)
L 7.75 (19.7) 9.75 (24.8) 11.75 (29.8) 14.75 (37.5)
B .60 (1.5) .60 (1.5) .60 (1.5) .60 (1.5)
M 3.88 (9.9) 4.88 (12.4) 5.88 (14.9) 7.38 (18.7)
T .60 (1.5) .60 (1.5) .60 (1.5) .60 (1.5)
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