8 Channel Temperature Data Logger

8 Channel Temperature Data Logger



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Description

Measurement Computing Logger Stores Temperature Recordings to Removable CompactFlash® Card


Feature

  • (8) Inputs for Thermocouples, RTDs, Thermistors and Semiconductor Sensor Probes
  • (2) Integrated Cold Junction Compensation (CJC) Sensors
  • An Independent Alarm for Each Input
  • (8) User-Configurable Digital I/Os Configured for Input or Output

Spesification

Maximum Logging Rate/Channel 2 Samples per second to PC
1 Sample per second to CF card
A/D Converters Four (4) Dual 24-bit Sigma-Delta type
Number of Channels 8 Differential Channels
Input Isolation 500 VDC minimum between field wiring and USB interface
Channel configuration Software programmable to match sensor type
Differential Input Voltage Range Thermocouple: ±0.080 Volts
RTD: 0 to 0.5 Volts
Thermistor: 0 to 2 Volts
Semiconductor Sensor: 0 to 2.5 Volts
Absolute Maximum Input Voltage Power On: ±25 Volt
Power Off: ±40 Volt
Input Impedance 5 Gigohm Minimum
Input Leakage Current Disabled Open Thermocouple Detect: 30 nA Maximum
Enabled Closed Thermocouple Detect: 105 nA Maximum
Rejection Ratio Normal Mode: 90 dB Minimum
Common Mode: 100 dB Minimum
Resolution 24 Bits
DC
30 Minutes Minimum
Open Thermocouple Detect Automatically enabled when the channel pair is configured for thermocouple sensors. The maximum open detection time is 3 seconds.
CJC Sensor Accuracy 15 °C to 35 °C ±0.25 °C Typical
±0.5 °C Maximum
0 °C to 70 °C -1.0 to +0.5 °C Maximum
Digital Input/Output Type CMOS
Number of Digital I/O 8 (DIO0 to DIO7)
Digital I/O Configuration Independently configured for input or output. 
Power on reset is input mode unless bit is configured for alarm.
Digital Pull up/Pull down Configuration All pins pulled up to +5 V via 47 K resistors (default). Pull down to ground (GND) also available.
Digital I/O Transfer Rate
(software paced)
Digital Input: 50 port reads or single bit reads per second
Digital Output: 100 port writes or single bit writes per second
Digital Input High Voltage High Voltage: 2.0 V Minimum; 5.5 V absolute Maximum
Low Voltage: 0.8 V Maximum; -0.5 V absolute Minimum
 
Digital Output Low Voltage (IOL = 2.5 mA): 0.7 V Maximum
High Voltage (IOH = -2.5mA): 3.8 V Minimum
Alarm Input Modes 1. Alarm when input temperature > T1
2. Alarm when input temperature > T1, reset alarm when input temperature goes below T2
3. Alarm when input temperature < T1
4. Alarm when input temperature < T1, resetalarm when input temperature goes above T2
5. Alarm when input temperature is < T1 or > T2
NOTE: T1 and T2 may be independently set for each alarm.
Alarm Output Modes Disabled: Digital I/O line may be used for normal operation.
Enabled: Active High Output (Digital I/O line goes high when a alarm conditions met)
Enabled: Active Low Output (Digital I/O line goes low when alarm conditions met)
Alarm Update Rate 1 Second
Standalone Power Supply USB Power Adapter
2.5 Watt USB Adapter with Interchangeable Plugs 
(Includes Plug for USA)
Memory Card Type Type: CompactFlash® Card 
Storage Capacity: 2GB Maximum
File System Format DOS FAT-16; the memory card must be formatted by the device prior to use for logging. The device only creates 8.3 file names and a flat directory structure ( no subdirectories). The memory card is readable by Windows operating systems after device format/use.
Logging Rate Minimum 1 second between entries, Maximum 232 seconds, 1 second granularity
Data Items Logged Timestamp, temperature or raw reading from selected channels, state of DIO lines, CJC Sensor Readings
Logging Start Methods Configurable:
1. Start Logging on Power Up - Logging begins 5 seconds after power on to allow hardware to settle.
2. Start Loggin on Button - Device is idle on power on. Press and hold button until LED comes on to begin logging. The first sample will be taken 1 second after LED comes on unless less than 5 seconds have elapsed since power on.
3. Start Logging at Specified Time - Device is idle until the real tme clock indicates the time is equal to or greater than the specified time, at which time the LED with come on. The first sample will be taken 1 second after LED comes on unless less than 5 seconds have elapsed since power on.

NOTE: Data Logging is not allowed when the device is attached to an active USB bus due to processing limitations. The device must be connected to the standalone pwer supply to perform data logging.
Logging Stop Methods Stop on button Press - To stop logging, press and hold button until LED turns off. 

NOTE: The device caches log data in volatile memory prior to writing to memory card. When logging, always use the button to stop logging and ensure data is written to memory card prior to removing power.
Logging Status Indication The LED operations when connected to the AC Adapter power supply are different than when connected to USB:

Logging modes:
1. Logging Off mode: the LED is off (disabled).
2. Start Logging on Power Up mode: the LED is on, with a momentary off flash every time data is captured.
3. Start Logging on Button mode: the LED is initially off. When the button is pressed and held for approxiamately 1 second the LED will turn on and act the same as Start Logging on Power Up mode.
4. Start Logging at Specified Time mode: the LED is off, with a momentary on flash every second until the specified date/time is reached. At that time, the LED will turn on and act the same as Start Logging on Power Up mode.

Other indication:
To Stop logging and store the remaining data to memorycard, press and hold the button until the LED turns off. It is then safe to remove the memory card.
If the memory card becomes full the LED will blink rapidly (250 ms period).
If the memory card is removed while logging is in progress the LED will blink rapidly (250 ms period). Inserting a memory card will stop the blinking.
Operating Range Temperature: 0 to 70°C
Humidity: 0 to 90% non-condensing
Storage Range Temperature: -40 to 70°C
Humidity: 0 to 90% non-condensing
OS Compatibility Windows 7, Vista, XP SP2+ (32-Bit or 64-Bit)
Dimensions 127mm x 88.9mm x 35.56mm