Related Manuals for Intab PC-Logger 3100i
Summary of Contents for Intab PC-Logger 3100i
- Page 1 How to use 3100i PC-logger accessories INTAB Interface-Teknik AB e-mail: info@intab.se www.intab.se...
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Page 3: Table Of Contents
CONTENTS BASIC UNIT ........................ 5 AN OVERVIEW ....................5 General ......................5 ”On-line” measurements ................6 ”Off-line” measurements................6 DISPLAY AND KEYS..................7 ......................7 LOCK STORAGE CAPACITY ..................8 Storage capacity in your computer .............. 8 Storage capacity in the ”3100i” ..............9 POWER SUPPLY .................... - Page 4 CONNECTING SENSORS ................40 Screw Terminals ..................40 Measurement Methods................41 TECHNICAL DATA ..................44 OPTION : MODEM PORT ..................45 DATA FORMAT....................45 CONNECTOR STANDARD................45 ”3100 ” MODEM SETTINGS ................ 46 MODEM ............... 47 OMPUTER SETTINGS INDEX......................... 48 INTAB Interface-Teknik AB...
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Page 5: Basic Unit
BASIC UNIT AN OVERVIEW 1.1 General The PC-logger model 3100i finds its use mostly in long term recording of process signals and/or temperatures. Possible input ranges are +/-50mV, +/-100mV, +/-1000mV, +/-10V, 20mA and thermoelectric voltages. Very high resolution (25 000 steps or divisions) and excellent accuracy (better than 400ppm) makes it possible to achieve remarkably good results from the most difficult measuring task. -
Page 6: On-Line" Measurements
LCD (see 2.). After all measurements are completed the ”3100i” is again connected to a computer for transferral of collected data. INTAB Interface-Teknik AB... -
Page 7: Display And Keys
Automatic scrolling is started with the key under the logo. A new channel is then shown every three seconds Try this feature by pressing the ”intab°” logo. RECORD is selected when you intend to collect data. Verify your choice with ”OK”. -
Page 8: Storage Capacity
A discussion of how the maximum length of a recording can be calculated from known parameters follows below. It is assumed that recordings are made using software supplied by INTAB. 3.1 Storage capacity in your computer The data storage capacity of your computer depends on the amount of free space on the disk that is to store your measurements. -
Page 9: Storage Capacity In The "3100I
3.2 Storage capacity in the ”3100i” The storage capacity of the ”3100i” is dependent on memory size. Three sizes of memory can be supplied: 64k, 576k or 1088k. Every value stored uses two bytes, making it easy to calculate available recording time. -
Page 10: Power Supply
Incoming serial (RS-232) commands or pressing the C-key will wake the ”3100i”. Recordings will of course proceed uninterrupted. Long sampling intervals (>10s) will allow the logger to fall asleep between samplings thus conserving battery power. INTAB Interface-Teknik AB... -
Page 11: Inputs - Ranges
INPUTS - RANGES All analogue channels are DIFFERENTIAL. They measure the voltage between - and GND and the voltage between + and GND. The subtraction is then performed internally. NOTE The GND is logger reference or signal ground. It has nothing in common with other system or safety grounds unless the operator interconnects them. -
Page 12: Preset Ranges
Channels are individually programmable. T/C linearization is individually selectable so that channels may even have different types of thermocouples connected. INTAB Interface-Teknik AB... -
Page 13: Ranges And Their Resolution
5.3 Ranges and their Resolution An ”3100i” is especially suited for monitoring process type signals and still has the very sensitive 50mV range available. The ranges and their resolutions are: RANGE RESOLUTION +/- 10V 0.4 mV +/- 1000mV 40µV +/- 100mV 4µV +/- 50mV 2µV... - Page 14 This adjusted voltage is then used as input variable to a linearizing table. The table (one for each thermocouple type) is constructed so that its contribution to the measurement error is negligible. INTAB Interface-Teknik AB...
- Page 15 5.4.2 Cold Junction Compensation When using thermocouples to measure temperature it is almost always necessary to know the temperature of the ”cold junction”. Thermoelectric voltage has to be ”adjusted” with respect to this temperature. Thermoelectric voltage is the result of the temperature difference between the cold junction and the hot junction.
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Page 16: Connectors
The 15 pin D-SUB connector has the following pin-outs: pin 2 : Tx pin 3 : Rx pin 5 : CTS pin 6 : DTR pin 7 : GND Leave the rest of the pins unconnected or damage may result!! Typical Computer to ”3100i” cables: INTAB Interface-Teknik AB... -
Page 17: Connecting Sensors And Transducers
6.3 Connecting Sensors and Transducers Sensors or Transducers are connected to the screw terminals that are accessible under the lid. The terminals are detachable and can be tilted 90°. Terminal assignment and polarity can be seen in the figure below. Use the 16 hole bracket as strain-relief for transducer cables. - Page 18 Also note that the ”3100i” analogue ground is the same electrical point as the RS-232 signal return AND the 0V of the power supply input connector. INTAB Interface-Teknik AB...
- Page 19 Connecting Sensors and Transducers (cont.). The impedance between the positive and negative inputs to ground is of the order of several MΩ. They must therefore never be allowed to float outside the specified common mode range, but must be referenced to ground in some way.
- Page 20 Connect your T/C:s DIFF Place switch in position ”DIFF” 2) T/C ”hot” junction isolated from measured object. Do NOT connect object to signal GND Connect your T/C:s Place switch in position ”GND” making them DIFF single ended INTAB Interface-Teknik AB...
- Page 21 6.3.2 Current Loops Current loops are usually process type signals (0 - 20mA). The transmitters that output this type of signal are usually ”floating” and don’t present any problem in so far as grounding is concerned. Problems can, however, arise because other equipment that receives this signal may or may not be grounded.
- Page 22 1) Signals with Common ground reference. Connect ”3100i” signal GND to system ground. Connect sensors Place switch in position DIFF ”DIFF” 2) ”Floating” signals. Leave signal GND unconnected. Connect your sensors Refer signals to GND by DIFF placing switch in position ”GND” INTAB Interface-Teknik AB...
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Page 23: Miscellaneous
(or booting) a new controller program (see 7.1). Bootable files reside on the same directory as your Intab PC-logger software. They are recognised by the .LDM extension. These Load Modules are different for different models of loggers. Your Intab logger software will always select the one appropriate for your logger. -
Page 24: Technical Specifications
30V continuous. Higher voltages may damage the inputs N.B.: current inputs are shunted by 51Ω 8.1.5 Ranges Preset: 0-20mA, +/-10V, +/-1000mV, +/-100mV or +/-50 mV Temperatures: 50mV thermo emf Thermoelectric voltages are linearized and cold junction compensated INTAB Interface-Teknik AB... - Page 25 Switchable: Four Voltage Ranges per Channel +/- 10V +/- 1000mV +/- 100mV +/- 50 mV One Current Range 0 - 20 mA Each channel has a switchable 51Ω shunt for the 20mA range. It is connected across the input by using the on-board switch (see 5.2).
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Page 26: Storage Memory
Data is transferred in a serial form to and from the computer. The serial standard conforms to a subset of RS-232. Format: 8 bit ASCII 1 start bit 8 data bits 1 stop bit 19200 baud 8.4 Commands See “Command Manual” INTAB Interface-Teknik AB... -
Page 27: Power
8.5 Power Voltage: 12 - 15 VDC Operating current: Max 400 mA (charging + operating) Charging current: Max 200 mA (initial) Max 60 mA (trickle) 8.5.1 Rechargeable Batteries Charging time: Min 40 hours with supplied mains adapter. Should be continuously (trickle-)charged. Capacity: Min 2 hours of operation with fully charged accumulators... - Page 28 INTAB Interface-Teknik AB...
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Page 29: Option: Digital I/O And Pulse Counters
This digital board is mainly used in event-counting applications but can also be used where status or on/off signals must be detected. INTAB PC-logger software support the use of the relay outputs as alarms. This card is available in two versions: with or without counters. -
Page 30: Digital Inputs
These are paralleled with the corresponding DO inputs and do not provide any isolation to the measured/monitored object. The auxiliary power output for these inputs is Vp. This voltage is derived from the internal battery through a current limiting resistor INTAB Interface-Teknik AB... -
Page 31: Counters
COUNTERS The digital I/O card can be fitted with six sixteen bit counters. Each of these counts up to 65535 and then wraps around to zero. They can be read with constant time intervals resulting in measurements values representing pulses per delta-t. Flowmeters output a set number of pulses per given unit of volume. -
Page 32: Connections
= Auxiliary Power (for P) DO 2b DI 6b DO 2a DI 6a DO 1b DI 5b DO 1a DI 5a DI 4b DI 4a DI 3b DI 3a DI 2b DI 2a DI 1b DI 1a INTAB Interface-Teknik AB... -
Page 33: Digital Outputs
3.1 Digital outputs The digital outputs are in the form of four normally open relays. These potential free contacts are accessible on DO1a,b - DO4a,b; see figure. DIGITAL OUTPUTS Switching Capability: Power - 30W/50VA Voltage - 45V AC/DC DO b Current - 1.25A AC/DC RELAY SPST... - Page 34 The TTL-compatible inputs (P = Pulse in) are connected as in the figure. Note that signal ground (GND) of the digital card has to be connected to signal ground of the system or transducer that is used with these inputs. TTL/CMOS AND/OR INTAB Interface-Teknik AB...
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Page 35: Technical Data (@ 25C +/-10C)
TECHNICAL DATA (@ 25°C +/-10°C) 4.1 Digital Outputs No of outputs Type : Potential-free relay contacts (NO, SPST) Switching capability Power : 30W/50VA Voltage : 45V AC/DC Current : 1.25A AC/DC Max. operating current : 1A @ 60°C 4.2 Digital Inputs 4.2.1 Opto-Isolated Inputs No of inputs ”Low”... -
Page 36: Auxiliary Power
4.3 Auxiliary Power 4.3.1 for Opto-Couplers Voltage : mains adapter output, max 15V. Current : mains adapter rating -300mA or max 200mA 4.3.2 for TTL-Inputs Voltage : 4-6V Impedance : 1kΩ INTAB Interface-Teknik AB... -
Page 37: Option : Constant Current Sources
OPTION : Constant Current Sources AN OVERVIEW Constant Current Sources have their natural use when measuring resistance. A resistor is in itself passive and does not lend itself to be measured unless special arrangements are made. It has to be tricked into revealing its value as a voltage that can be measured and logged. -
Page 38: Temperature Measurements With Pt-100 Sensors
A class B Pt-100 has an uncertainty of +/-0.8°C at 100°C and a class A Pt-100 has an uncertainty of +/-0.35°C at 100°C. These possible errors have to be added to the ”3100i” uncertainty to get a reliable estimate of total system uncertainty. INTAB Interface-Teknik AB... -
Page 39: Description
DESCRIPTION Each constant current sources board may have 8, 16 or 24 constant current outputs. Every group of 8 sources is really only one source that is multiplexed in turn to the eight outputs. This means that the constant current is not flowing all the time. It is only present and constant during the time its associated channel is being sampled. -
Page 40: Connecting Sensors
It should pass through the sensor resistance and return to the ”-”-terminal. This minus terminal is in actual fact the ”3100i” reference ground or as it is usually called: GND. The Diff/Gnd switch should be in the Diff position !!!! (Hopefully you had realised this already.) INTAB Interface-Teknik AB... -
Page 41: Measurement Methods
3.2 Measurement Methods There are several ways of connecting, and measuring the value of, resistive components. Here follow a few: The four-wire resistance measurement method is the most straight forward and accurate method. The five-wire method also has its place in some applications. A three-wire version of the five-wire method can also be employed where the demand for accuracy is small. - Page 42 ⇓ Constant Current Sources Pt100 Pt100 With this method all sensors are referenced to ”3100i” signal ground via the constant current return ( - ). The Diff/Gnd switch must consequently be in the Diff position ( right? ). INTAB Interface-Teknik AB...
- Page 43 3.2.2 Five-Wire Resistance Measurements This method is used when there is a requirement for a wider range than is possible using the four-wire technique when measuring temperature with an RTD (Pt-100). By using the "differentiality" of the analogue channels a base level resistance (like 100Ω...
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Page 44: Technical Data
This will give best and most accurate readings. TECHNICAL DATA At 25°C and nominal current 500µA (other ranges on request) Constant Current 500µA Accuracy +/-0.5µA Compliance 2.5V (0≤RL≤5kΩ) Tempco (max) +/-150ppm/°C INTAB Interface-Teknik AB... -
Page 45: Option : Modem Port
OPTION : Modem Port ”3100i”:s may on demand be fitted with a modem port. This serial port is specially adapted to modems. DATA FORMAT The serial data format between the ”3100i” and a modem is: 1 Start Bit 8 Data Bits 1 Stop Bit No Parity CONNECTOR STANDARD... -
Page 46: "3100I" Modem Settings
! :There is no normal way to include the [Enter] character in a string. The ! replaces it. £ : Some MODEMS are not able to receive multiple commands without a break in between. The £ introduces a 2 second pause. INTAB Interface-Teknik AB... -
Page 47: Computer Modem Settings
Computer MODEM settings It is not always a trivial task to get modem communications to work. There are several parameters that have to be correctly set up. MODEMS do not necessarily have to be of the same type but it usually helps. MODEMS of your choice have to be set up to report DCE line speed and error correction method. -
Page 48: Index
· 12 linearization tables · 12 downloading · 6 linearized · 13 D-SUB · 16 Load Modules · 23 DTE connector · 45 duration · 8 mains adapter · 10 mains fails · 10 E · 12 INTAB Interface-Teknik AB... - Page 49 master reset · 23 RING · 46 miniature switches · 19 RS-232 · 26 misreadings · 15 RTC · 5 MODEM BAUDRATE · 46 RTD · 38 modem control · 46 modem port · 45 multimeter · 12 MULTIMETER · 7 S ·...
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