HPT-L
Multichannel Process Inspection Instrument
HPT-L panel instrument for inspecting temperature and process-signal inputs, with LED indication, high/low contact alarms, serial communication and a microprinter interface.
- Measurement accuracy
- ±0.2% FS
- Communication interfaces
- RS-485 two-wire / RS-232 three-wire
- Communication protocol
- Modbus RTU
Supplied by WKSENSOR. Ask us about pricing, availability and delivery.
Product overview
Vertical panel instrument
Tall display face with lower control keys and visible side mounting and terminal features.
| Input version | Shown channel labels |
|---|---|
| Thermocouple | A: −; B: + |
| Three-wire Pt100 | A, B and C |
| Two-wire transmitter current signal | A: −; D: + |
The channel-input diagrams show temperature-element and electrical-signal configurations, including voltage and mV inputs.
Overrange flashing and high/low contact alarms with deadband accompany the inspection display. The microprinter configuration provides manual, timed or alarm-triggered output.
| RS-485 | 9 A / 10 B |
|---|---|
| RS-232 / RS-232C | 8 GND / 9 RXD / 10 TXD |
| Unified analogue retransmission | 11 − / 12 +; current or voltage configuration |
| Main-to-sub-unit COM | 4 + / 5 − |
| Cold-junction compensation input | 1 black / 2 yellow / 3 red wire |
| DC supply version | 13 + / 14 − |
| AC supply version | 13 L / 14 N |
| Auxiliary excitation 1P | 15 − / 16 + |
| Auxiliary excitation 2P | 17 − / 18 + |
| Common alarm AL2 | 19 NC / 20 common / 21 NO |
| Common alarm AL1 | 22 NC / 23 common / 24 NO |
The main-unit terminal reference is separate from the alarm and analogue-output sub-unit diagrams.
Configuration and selection
Serial communication
Two-wire RS-485 or three-wire RS-232 with Modbus RTU, 1,200–19,200 bps. Communication distances: RS-485 ≤1,000 m; RS-232 ≤15 m.
Power and excitation
100–240 V AC/DC or 20–29 V DC main-power versions. Auxiliary excitation is 24 ±1 V DC, ≤30 mA, with load resistance ≥750 Ω.
Technical reference
Specifications and options
| Parameter | Specification or option |
|---|---|
| Model | HPT-L |
| Instrument function | Multichannel process inspection instrument |
| Indication | LED numerical display |
| Measurement accuracy | ±0.2% FS |
| Input configurations | Thermocouple / three-wire Pt100 / current / voltage / mV |
| Alarm functions | Overrange flashing; high/low contact alarms with deadband |
| Contact rating | 220 V AC / 2 A; 24 V DC / 2 A, resistive load |
| Communication interfaces | RS-485 two-wire / RS-232 three-wire |
| Communication protocol | Modbus RTU |
| Serial framing | 1 start bit / 8 data bits / 1 stop bit / no parity |
| Baud rate | 1,200–19,200 bps |
| Communication distance | RS-485 ≤1,000 m / RS-232 ≤15 m |
| Printing interface | RS-232 microprinter; manual / timed / alarm printing |
| Auxiliary excitation | 24 ±1 V DC, ≤30 mA; load resistance ≥750 Ω |
| Main power configurations | 100–240 V AC/DC, ≤5 W (AC 50/60 Hz) / 20–29 V DC, ≤3 W |
| Operating environment | −10–50°C; no condensation or icing |
| Brand | WKSENSOR |
| Product reference | HH-841918846939 |
Application scenarios
Oil, chemicals, power, energy, water and industrial automation; metallurgy, papermaking, food processing, heat treatment and machinery applications.
Oil
Oil-field pumps and pipework.
Chemicals
Process tanks, columns and piping.
Power
Outdoor electrical substation.
Energy
Rows of solar panels.
Water
Treatment basins and railings.
