BLUE JAY BJ-QPA(T) Single Phase AC Transducer User Manual
Features:
- Accurate, reliable, current measurement
- Measure Single-phase system
- True RMS measurement, can work in harmonic electric grid
- Input: AC voltage or current signal (Refer to instrument labels)
- Output: DC 4 ~ 20 mA, Analog signal (Refer to instrument labels)
- RS485 port optional
Technical Parameters:
| Power Supply | AC 85~265V |
| Input | Current : 0~5A, 0~1A… Voltage: 0~100V, 0~400V… |
| Output | DC 4 ~ 20 mA, 0-20mA, 0-5V(refer to the label) |
| Accuracy | ≤ ±0.5% |
| Accuracy drift | Annual Variation < 0.2% |
| Response time | ≤ 400 ms |
| Isolation | Input / output / power supply |
| Power consumption | DC ≈ 3W, AC ≈ 4VA |
| Case Material | ABS fireproof materials |
| Insulation Voltage | AC 2KV RMS / min |
| Weight | About 250g |
| Insulation Resistance | Current output: 0<Lr<510Ω; Voltage output: Lr>10KΩ |
| Dimension | 135 (L) X 23(W) X 92(H) mm |
| Installation | Fixed in a standard 35mm (1.38 inch) DIN rail or screwed on the cabinet |
| Working Condition | 0 ~ 50 ℃/ less than 95% RH (Non-condensing) |
| Storage Conditions | -20 ~ 70℃/ less than 70% RH (Non-condensing) |


Notes
- Pin 1,2 for power supply AC(DC)85-265V.
- Pin 6,8 for measurement signal input, Make sure the product parameters on the label are the same to your order, if not, please contact BLUE JAY sales team, [email protected].
- For input AC signal, there is no polarity difference. For input DC signal, Pin8 for positive (+); Pin 6 for negative (-).
- Output signal for 4~20mA, access pin 4 for positive (+); Pin 5 for negative (-).
Output signal for 0~5V, access pin 11 for positive (+); Pin 5 for negative (-).
! Do read and full understanding of the controller wiring, if cannot sure the connection, please contact BLUE JAY technical support tech@cqbluejay.com for more help.
RS485 Communication
| Code: | Meaning: | Description: |
| FUNCTION 03 | Reading of n Words | This function permits to read all the electrical parameters of the BJ194…series. |
| FUNCTION 16 | Preset Multiple Registers | Write value in to the relevant register |
| Address | Data | Description | Byte | Instruction |
| 2 | point | Decimal point position | 4,5 | |
| 3 | SIGN | Sign bit | 6,7 | 1 for negative, 0 for plus |
| 0 | U/I | L-N value | 0,1 | |
| 1 | PR | Frequency | 2,3 | |
| 2 | UC/UCA | C-phase volt | 4,5 | |
For any inquiry about the instrument performance or whether any failure
happens, contact to Blue Jay’s technical service.
Blue Jay – After-sales service
Building 13, 2-8, Jialing third village Pioneer Park,
Jiangbei District , 400020 Chongqing
Tel – + 0086 023 86850812
Fax – + 0086 023 67636974
E-mail : [email protected]



















