PR Electronics HART 7 temperature converter, loop-powered PR 3337
2026-03-16

PR3337 HART 7 temperature converter, loop-powered
Environmental Conditions
| Operating temperature |
-25°C to +70°C |
| Storage temperature |
-40°C to +85°C |
| Calibration temperature |
20…28°C |
| Relative humidity |
< 95% RH (non-cond.) |
| Protection degree |
IP20 |
| Installation in |
Pollution degree 2 & meas. / overvoltage cat. II |
Mechanical specifications
| Dimensions (HxWxD) |
113 x 6.1 x 115 mm |
| Weight approx. |
70 g |
| DIN rail type |
DIN EN 60715/35 mm |
| Wire size |
0.13…2.5 mm2 / AWG 26…12 stranded wire |
| Screw terminal torque |
0.5 Nm |
| Vibration |
IEC 60068-2-6 |
| 2…25 Hz |
±1.6 mm |
| 25…100 Hz |
±4 g |
Common specifications
| Supply voltage |
6.2…35 VDC |
| Max. required power |
0.80 W |
| Internal power dissipation |
22 mW…0.8 W |
| Isolation voltage, test / working |
2.5 kVAC / 300 VAC (reinforced) |
| Zone 2 / Div. 2 |
250 VAC |
| HART mode, (0…90%, 100…10%) |
60 ms…60 s, programmable |
| DIP mode, (0…90%, 100…10%) |
< 60 ms |
| Voltage drop |
6.2 VDC |
| Signal / noise ratio |
Min. 60 dB |
| Programming |
DIP switches |
| Signal dynamics, input |
23 bit |
| Signal dynamics, output |
18 bit |
| EMC immunity influence |
< ±0.5% of span |
| Extended EMC immunity: NAMUR NE21, A criterion, burst |
< ±1% of span |
| Incorrect DIP-switch setting identification |
3.5 mA |
Input specifications
| Temperature range, Pt100 |
-200…+850°C |
| Accuracy: the greater of |
Better than 0.05% of span or 0.1°C |
| Temperature coefficient: the greater of |
0.02°C/°C or ≤ ±0.01%/°C |
| Sensor current |
< 150 µA |
| Sensor cable resistance |
< 50 Ω per wire |
| Effect of sensor cable resistance (3-/4-wire) |
< 0.002 Ω / Ω |
| Sensor error detection |
Yes – selectable via DIP-switch |
| Broken sensor detection |
> 800 Ω |
| Shorted sensor detection |
< 18 Ω |
| Temperature range, TC J |
-100…+1200°C |
| Temperature range, TC K |
-180…+1372°C |
| Accuracy: the greater of |
Better than 0.05% of span or 0.5°C |
| Temperature coefficient: the greater of |
0.1°C/°C or ≤ ±0.01%/°C |
| Sensor cable resistance |
< 5 kΩ per wire |
| Cold junction compensation (CJC): Accuracy @ external Pt100 input |
Better than ±0.15°C |
| Cold junction compensation (CJC): Accuracy @ internal CJC |
Better than ±2.5°C |
Output specifications
| Updating time |
10 ms |
| Programmable signal ranges |
4…20 and 20…4 mA |
| Load (@ current output) |
≤ (Vsupply – 6.2) / 0.023 [Ω] |
| Load stability |
≤ 0.01% of span / 100 Ω |
| Sensor error indication |
3.5 mA or 23 mA / acc. to NAMUR NE43 or OFF |
| HART protocol revisions |
HART 7 |