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| 2-WIRE ISOLATED TEMPERATURE TRANSMITTER ------------------------------------------------------------------------------TRX20 |
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| INPUT : Thermocouple, Millivolts |
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- Solder jumpers for
- Input type
- Span
- Upscale / Downscale
- High accuracy and stability
- 10~30 V DC supply
- Isolation between input and output
1500 V AC RMS / 1 minute
250 V AC RMS, continuous
- Multirange : 4 for thermoouple, 5 mV to 50 mV
4 for millivolts, 5 mV to 50 mV
- Multiinput : TC E, J, K, L, N, R, S & T inputs or millivolts
- 0.1% voltage linear 4~20 mA output
- Upscale / downscale selectable sensor break detection
- ON LED shows state
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GENERAL
TRX20 is a 2-wire isolated transmitter suitable for thermocouple or millivolt input. It provides isolation between the input and the 4~20 mA output current. It finds applications for use with grounded thermocouples, PLCs, DCS, etc.
TRX20 -TC covers 8 thermocouple types as well as millivolts and has 4 overlapping ranges. It has a voltage linear output.
All selections are made by solder jumpers. 'Fine' ZERO / SPAN potentiometers are provided for calibration.
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| SPECIFICATION All specifications at ambient of 25° C, unless specified otherwise |
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| INPUT |
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| Input type |
Thermocouple : E, J, K, L, N,
R, S & T Millivolts (See Table
1) |
| Input impedance |
> 5 M Ω |
| Monitoring |
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| Sensoe break detection # |
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| Upscale current |
~ 26 mA |
| Downscale current |
~ 3.5 mA |
| ON LED |
Provided |
| Adjustments |
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| Span selectable |
5 to 50 mV, 4 overlapping
ranges (See Table 2) |
| Range |
User to specify*
* Ranges in
°C/°F for
thermocouples
* All ranges are zero based
(eg 0~1000°C, 0~50 mV)
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| Output |
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| Current |
4~20 mA |
| Linearity |
Voltage linear |
| Current limit |
~26 mA |
| Permissible load |
600 Ω @ 24 VDC, 22 mA (see Fig 2) |
| Isolation |
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| Mutual isolation |
a) 1500 V AC RMS, 50 hz/1
minute |
| between input & output |
b) 250 V AC RMS, 50 hz,
continuous |
| Accuracy |
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| Linearity & calibration |
± 0.1% of span ±
thermocouple non-linearity
for span ℑ7.5 mV
± 0.02% of span ±
thermocouple non-linearity
for span < 7.5 mV
(Error due to thermocouple
non- linearlity can be
significant. It depends on thermocouple type & span, being largest in T, R, & S
type thermocouples) |
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Temperature effect on
accuracy |
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| Millivolts |
± 0.025% of span per °C |
| Thermocouples |
± 0.025% of span per °C ±
0.1 °C per °C (for TC T)
± 0.025% of span per °C ±
0.05 °C per °C (for other TC
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| Cold junction |
Automatic |
| compensation |
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| Supply voltage / load effect |
± 0.002% of span / V |
| Power supply |
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| Supply voltage |
10 to 30 V DC |
| Enclosure |
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| Din rail mount |
See Fig 3 |
| Material |
ABS plastic |
| Dimensions (in mm) |
80(H) x 25(W) x 85(D) |
| Mounting |
Snap on for 35 mm DIN rail
to DIN 46277 |
| Weight |
<200 grams |
| Protection |
IP20 |
| Field mount |
See Fig 4 |
| Material |
Cast aluminium |
| Dimensions (in mm) |
95(H) x 95(W) x 50(D) |
| Mounting |
Field |
| Weight |
500 grams |
| Protection |
IP 54 |
| Connection, single / |
≤2.5 mm2 , AWG14 |
| stranded wires |
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| Temperature, Humidity |
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| Ambient, storage |
-20 ~ +85 °C |
| Ambient, Operation |
-20 ~ +55 °C |
| Relative humidity |
0 ~95% |
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| Table 1 |
| Input selection# |
| TC E |
| TC J / L |
| TC K / T |
| TC N |
| TC R / S |
| Millivolts |
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| Table 2 |
| Span selection(mV)# |
| 4.5 ~9 |
| 8 ~ 18 |
| 14.5 ~ 32 |
| 29.5 ~ 52 |
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| # User selectable by solder jumpers |
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