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 • UNIQUE PUSH BUTTON CALIBRATION
• RE RANGEABLE WITHOUT A PC
• RTD, TC INPUT
• LED OVER-RANGE INDICATION
• GALVANIC ISOLATION ON TC TYPES
• DRIFT FREE LINEARISATION
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Introduction
A simple push button operation, ranges and calibrates the HMT (4 to20) mA temperature transmitter, eliminating the need for soldering links, potentiometers or PC's.
The HMT in-head mounted transmitter incorporates the latest digital technology to ensure accurate drift free linearisation. It connects to an appropriate sensor and converts the output to a linear (4 to) mA output signal, providing a Level of performance at a cost that was not possible with earlier analogue types.
High accuracy and stability coupled with the flexibility of reduced stock holding and the quick and way of bench re-ranging makes the HMT the ideal choice for the majority of temperature sensing requirements.
The HMT is linearised to comply with all common RTDs & Thermocouples.
An on board LED indicates the successful completion of the range programming and also provides an instant indication of sensor health.
Calibration Procedure
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Connect a simulator / calibrator to the input and between 8 & 30 VDC to the output of the HMT.
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Set the simulator to the desired temperature at 4 mA. Press and HOLD the calibration button until the LED stars to blink.
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set the simulator to the desired temperature at 20 mA. Press the calibration button and release. The LED continues blinking and then shuts off confirming that the unit is calibrated.
| Specifications @ 20 0C General |
| Sample Rate |
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500 ms |
| Sensor Lead Leng |
: |
Maximum length 3 m |
| Terminals |
: |
Screw terminals |
| Warm-up Time |
: |
120 s to full accuracy |
| Display |
: |
Slow flash indicates programming mode. Full on indicates out of range sensor. |
| Switch |
: |
Momentary push button |
| Calibration Period |
: |
12 months to maintain published specification 5 years to twice specification |
| Warranty |
: |
1 year |
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| Environmental |
| Operating Temp. Rang |
: |
(-20 to 80) ºC |
| Ambient Humidity |
: |
(0 to 95) % non condensing |
| Ambient Storage Temp. |
: |
(-40 to 90) ºC |
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| Enclosure |
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ABS Case |
| Material |
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(Polyurethane Encapsulated) |
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| Input |
| Sensor & Ranges |
: |
3 wire Pt100 (Pt500 or Pt1000 to order) |
| Default Range |
: |
(0 to 100) ºC |
| Accuracy |
: |
± 0.1 0C ± 0.1% rdg (-100 0C to 500) ºC
± 0.2 0C ± 0.2 % rdg (-200 0C to 850) ºC |
| Linearisation |
: |
BS EN 60751, BS 1904 (DIN 437600)
JISC 1604 (0.003916) |
| Input/Out Isolation |
: |
N/A |
| Excitation Current |
: |
1 mA maximum |
| Lead Resistance |
: |
10 W per leg 0.02 % Full Range output/ W
(plus lead resistance mismatch) |
| Thermal Drift |
: |
Zero± 0.01 0C/ºC
Span0.05 %/ºC |
| Minimum Span |
: |
5 ºC |
| Input |
HMT |
Input |
HMT |
| Sensors & Ranges |
Other combinations available to special order |
| HMT-1 |
K |
(-200 to 1370) ºC |
Default Range |
k (0 to1000) ºC
R (0 to1000) ºC
J (0 to1000) ºC
K (0 to1000) ºC |
| J |
(-200 to 1200) ºC |
| T |
(-200 to 400) ºC |
| HMT-2 |
R |
(0 to1760) ºC |
Accuracy |
± 0.04 % FS ± 0.04 % rdg or 0.5 ºC (whichever is greater) |
| S |
(0 to 1760) ºC |
| B |
(0 to 1820) ºC |
HMT-3
|
J |
(-200 to 1200) ºC |
Linearisation |
BS4937/IEC 587-1 |
| L |
(-200 to 1200) ºC |
| E |
(-200 to 1000) ºC |
| HMT-4 |
K |
(-200 to 1370) ºC |
Input/ Out Isolation |
50 VDC
(tested to 200 V) |
| N |
(0 to 1300) ºC |
| R` |
(0 to 1760) ºC |
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Cold Junction Error |
± 0.2 ºC |
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Cold Junction Range |
(-20 to 80) ºC |
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Thermal Drift |
Zero± 4 mv/ ºC Typical Span0.01 %/ºC |
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Minimum Span |
10 ºC |
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Click to view Mechanical Details Wiring Connections
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