Time Electronics 7068 - RTD Temperature Calibrator Module
The 7068 is a process control module that combines a precision digital thermometer (using RTD probes) with an RTD/ohms calibrator.
Easy to use, it solves the problem of making high accuracy temperature measurements without using bulky mains powered instrumentation.
It can also be used as an external temperature reference for dry block and other precision temperature baths.
Modes of Operation
Monitor Mode (4 wire):
Typical Functions
1. Check RTD probes by measuring their resistance at known temperatures.
2. Measure resistance values.
3. Indicate temperature when connected to an RTD probe.
4. Can be pre-programmed with a particular RTD’s characteristics to allow very high accuracy.
The 7068 may be used with a calibrated and certified probe to produce a highly accurate thermometer. The performance can be further enhanced by programming the actual characteristic of the probe into the unit.
Simulator Mode (4 wire):
Typical Functions
1. Output resistance of precise known value.
2. Simulate an RTD value from an RTD table chart.
3. Simulate an RTD value using the internal table.
Enhanced performance may be achieved by programming the unit to simulate the characteristic of a particular probe.
Five fixed step points (0, 25, 50, 75, 100%) are available between a user set minimum (0%) and a maximum (100%). Programmable ramp function is also available.
- 0.05°C accuracy, 0.01°C resolution
- 0.03Ω accuracy, 0.01Ω resolution
- 2, 3 and 4 wire connections
- Read and simulate °C, °F, °K, Ω
- Ramp and step
- PT100 plus 7 other RTD types
- User programmable
Modes of Operation - Detailed Specifications
|
Typical Functions |
1. Check RTD probes by measuring their resistance at known temperatures. 3. Indicate temperature when connected to an RTD probe. 4. Can be pre-programmed with a particular RTD’s characteristics to allow very high accuracy. |
| Excitation current | 1mA on all ranges |
| Resistance range | 0.01Ω to 2.6kΩ |
| Resolution | 0.01Ω |
| Accuracy | See specifications below |
| Auto re-calibration | Every 0.6 secs |
| Temperature stability | Better than 0.0015% per °C |
| Max/Min values | Logged automatically |
The 7068 may be used with a calibrated and certified probe to produce a highly accurate thermometer.
The performance can be further enhanced by programming the actual characteristic of the probe into the unit.
|
Typical Functions |
1. Output resistance of precise known value. 2. Simulate an RTD value from an RTD table chart. 3. Simulate an RTD value using the internal table. |
| Excitation current | 0.6mA to 1mA |
| Resistance range | 0.01Ω to 2.6kΩ |
| Resolution | 0.01Ω |
| Accuracy | See specifications below |
| Auto re-calibration | Every 0.6 secs. |
| Temperature stability | Better than 0.0015% per °C |
Enhanced performance may be achieved by programming the unit to simulate the characteristic of a particular probe.
Five fixed step points (0, 25, 50, 75, 100%) are available between a user set minimum (0%) and a maximum (100%).
Programmable ramp function is also available.
| Element | Alpha Coefficient | Temp Range °C | Accuracy °C | Temp Range °F | Accuracy °F |
|---|---|---|---|---|---|
|
Pt100 DIN |
0.003850 |
-200 to 250 |
0.05 |
-330 to 480 |
0.10 |
|
Pt100 US |
0.003916 |
-100 to 250 250 to 457 |
0.05 0.07 |
-150 to 480 480 to 850 |
0.10 0.14 |
| Pt200 DIN | 0.003850 | -200 to 300 | 0.05 | -330 to 570 | 0.10 |
|
Pt500 DIN |
0.003850 |
-200 to 250 250 to 630 |
0.05 0.07 |
-330 to 480 480 to 1160 |
0.10 0.14 |
|
Pt1000 DIN |
0.003850 |
-200 to 250 250 to 630 |
0.05 0.07 |
-330 to 480 480 to 1160 |
0.10 0.14 |
| Ni 120 | 0.006180 | -100 to 200 | 0.05 | -150 to 390 | 0.10 |
| Ni 1000 | 0.006180 | -100 to 200 | 0.05 | -150 to 390 | 0.10 |
| Range (Ohms) | Monitor | Generator |
|---|---|---|
| 20 to 400 | 0.03Ω | 0.03Ω |
| 400 to 800 | 0.10Ω | 0.10Ω |
| 800 to 1200 | 0.20Ω | 0.20Ω |
| 1200 to 2600 | 0.50Ω | 0.50Ω* |
* plus additional error of 0.05% of output value. If excitation current is less than 1mA.
| Module Width | 107mm (primary or secondary console fitting) |
| Optional Extras | Calibration certificates traceable to NPL and UKAS |
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