| DT85 Data Logger |
| Digital Channels |
| No. of Channels: |
16 analog input channels (expandable to 300*)
one isolated 3-wire or 4-wire input
or two isolated 2-wire inputs
or three common referenced 2-wire inputs. |
| Two wire with common reference terminal: |
48 (expandable to 800*) |
| Two wire isolated: |
32 (expandable to 600*) |
| Three and four wire isolated: |
16 (expandable to 300*) |
| *Expansion requires optional CEM20 |
| Input Ranges |
| Fundamental Input Ranges |
The fundamental inputs that the DT85 can measure
are voltage, current, resistance and frequency.
All other measurements are derived from these.
Auto-ranging is supported over 3 ranges. |
| Voltage & Current |
Full Scale |
Resolution |
| Input Ranges |
±30 mVdc
±300 mVdc
±3 Vdc
±30 Vdc
±0.3 mA
±3 mA
±30 mA |
0.25 μV
2.5 μV
25 μV
250 μV
2.5 nA
25 nA
250 nA |
| Resistance |
Full Scale |
Resolution |
| Input Ranges |
100 Ω
1000 Ω
10,000 Ω
100 Hz
10 kHz |
1.5 mΩ
15 mΩ
150.00 mΩ
0.0002 %
0.0002 % |
| Accuracy |
| Resistance |
5°C to 40°C |
– 45°C to 70°C |
DC Voltage
|
0.1% |
0.35% |
DC Current
|
0.15% |
0.45% |
DC Resistance
|
0.1% |
0.35% |
| Frequency |
0.1% |
0.25% |
| Channels | Sampling Rate |
| channels |
1 analog input channel
The channel supports: one isolated 3-wire or 4-wire
input, or two isolated 2-wire inputs,
or three common referenced 2-wire inputs. |
| Resolution |
18 bits |
| Fastest |
25Hz |
| Linearity |
0.01% |
| Common mode rejection: |
>90dB |
| Line series mode rejection: |
>35dB |
| |
| Inputs |
| Inter-Channel Isolation: |
100V (relay switching) |
| Resolution |
100V (opto-isolated) |
| Input impedance: |
100KΩ, >100MΩ |
| Common mode range: |
±3.5V or ±35V on 30V range |
| Sensor Excitation (Supply) |
| Analog channel: |
Selectable 250μA or 2.5mA precision
current source, 4.5V voltage source, or switched external
supply. |
| General Purpose: |
Switchable 12V regulated supply for powering sensors & accessories. (max 150mA) |
| Analog Sensors |
Supports a wide range of sensors including, but not
limited to, those listed below. A wide range of sensor
scaling and linearizing facilities including polynomials,
expressions and functions. |
| Thermocouples |
| input: |
B, C, D, E, G, J, K, N, R, S, T |
| Calibration standard: |
ITS-90 |
| RTDs |
| input: |
Pt, Ni, Cu |
| Resistance range: |
10Ω to 10KΩ |
| Thermistors |
| input: |
YSI 400xx Series, other types* |
| Resistance range: |
<10kΩ** |
* Other thermistor types are supported by scaling and calculated channels.
**Resistance range can be increased with the use of a parallel resistor. |
| Monolithic Temperature Sensors |
| Types supported: |
LM34 - 60, AD590, 592, TMPxx, LM135, 235, 335 |
| Strain Gauge and Bridge Sensors |
| Configurations: |
¼ , ½ & full bridge |
| Excitation: |
voltage or current |
| 4-20mA Current Loop |
| |
Internal 100R shunt or external shunt resistor |
| Relay Outputs |
| |
1 latching relay, contacts (max: 30Vdc, 1A) |
| Digital Channels |
| Channels: |
8 bi-directional channels |
| Input Type: |
8 logic level (max 20/30V) |
| Output Type: |
4 with open drain FET
(max: 30V, 100mA), 4 with logic output. |
| Counter Channels |
| Low Speed Counters |
8 counters shared with digital inputs.
Low speed counters do not function in sleep mode |
| Size: |
32 bit |
| Max Count rate: |
10 Hz |
| Dedicated Counter Inputs |
| Channels: |
4 high speed or 2 phase encoder (quadrature) inputs |
| Size: |
32 bit |
| Max Count rate: |
10 Hz |
| Serial Channels |
| SDI-12 |
1 SDI-12 input, shared with digital channel.
The input can support multiple SDI-12 sensors |
| Generic Serial Sensor |
| Flexible options to allow data to be logged from a wide range of smart sensors and data streams. |
| Available ports: |
Host RS232 Port* |
| Baud rate: |
300 to 115200 |
| *If used as a Serial Sensor channel then the Host Port is not available for other communications |
| Calculated Channels |
| Combine values from analog, digital and serial sensors using expressions involving variables and functions. |
| Functions: |
An extensive range of Arithmetic, Trigonometric, Relational, Logical and Statistical functions are available. |
| Alarms |
| Condition: |
High, low, within range and outside range |
| Delay: |
Optional time period for alarm response |
| Actions: |
set digital outputs, transmit message, execute any dataTaker command |
| Scheduling of Data Acquisition |
| No. of schedules: |
11 |
| Schedule rates: |
10ms to days |
| Data Storage |
| Internal Storage |
| Capacity: |
128MB = approx 10,000,000 data points |
| USB Storage |
| Types: |
Compatible with USB 1.1 or USB 2.0 drives, e.g. Flash drive |
| Capacity: |
Approx. 90,000 data points per megabyte |
| Communication Interfaces |
| Ethernet Port |
| Interface: |
10BaseT (10Mbps) |
| Protocol: |
TCP/IP |
| USB Port |
| Interface: |
USB 1.1 (virtual COM port) |
| Protocol: |
ASCII command |
| Host RS232 Port |
| Speed: |
300 to 115200 baud (57,600 default) |
| Flow Control: |
Hardware (RTS/CTS), Software (XON/XOFF), None |
| Modem support: |
auto-answer and dial out |
| Protocols: |
ASCII Command, TCP/IP (PPP), Modbus, Serial Sensor |
| Network (TCP/IP) Services |
| Command Interface |
Access the ASCII command interface of the DT85 via
TCP/IP |
| Web Server |
Access current data and status from any web browser. Custom pages can be defined. Download data in CSV format. Command interface window. Define mimic displays. |
| Modbus Server (slave) |
Access current data and status from any Modbus client (e.g. SCADA system) |
| FTP Server |
Access logged data from any FTP client or web browser |
| FTP Client |
Automatically upload logged data direct to an FTP server |
| System |
| Display and Keypad |
| Type: |
LCD, 2 line by 16 characters, backlight |
| Display Functions |
Channel data, alarms, system status. |
| Keypad: |
6 keys for scrolling and function execution |
| Status LEDs: |
4 for sample, disk, attention and power |
| Real Time Clock |
| Normal resolution: |
200μs |
| Accuracy: |
±1 min/year (0°C to 40°C), ±4 min/year (-40°C to 70°C) |
| Typical Operating Time |
| Real Time Using 12Vdc external power source |
| 1 second |
1 day |
| 5 second |
3 day |
| 1 minute |
1 month |
| 1 hour |
9.5 months |
| Power Supply |
| External voltage : |
10 to 30Vdc |
| Internal battery: |
6Vdc 1.2Ahr lead acid |
| Peak Power: |
12W (12Vdc 1A) |
| Physical and Environment |
| Construction: |
Powder coated zinc and anodized aluminum |
| Dimensions: |
180 x 137 x 65mm |
| Weight: |
1.5kg (4kg shipping) |
| Temperature range: |
–45°C to 70°C * |
| Humidity: |
85% RH, non-condensing |
| *reduced battery life and LCD operation outside range –15°C to 50°C |
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