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SK-RHC Catalogue
Temperature Transmitter SK-RHC
151.96KB
Sato SK-RHC Series Temperature and Humidity Transmitters
The Sato SK-RHC Series measures temperature and humidity with a local display and output for compatible monitoring equipment.
- Voltage, 4–20 mA or RS-485 versions selected when ordering.
- Plug-in, remote and miniature flexible probe options.
- Relay alarm with an upper or lower threshold for each parameter.
- Selectable 1-second or 10-second refresh interval.
- Probe purchased separately; measurement range and accuracy depend on the probe.
Sato SK-RHC Series Temperature and Humidity Transmitters
The Sato SK-RHC Series combines a local temperature and humidity display with an output for a compatible recorder, indicator or monitoring system. Choose the transmitter output and a suitable SK-RHCS probe to match the measurement location and receiving instrument.
Key Features
- Temperature and relative humidity measurement with a local display.
- Voltage, 4–20 mA or RS-485 versions selected when ordering.
- Three probe designs: plug-in, remote sensor and miniature flexible sensor.
- Relay alarm output with an upper or lower threshold for each parameter.
- Selectable 1-second or 10-second refresh interval.
The probe is purchased separately. An optional AC adapter is also available.
Choose the Transmitter Output
These are separate ordering versions; one unit does not provide every output option.
| Model | Catalogue number | Output version |
|---|---|---|
| SK-RHC-V | 8920-01 | Voltage: 0–1 V humidity output |
| SK-RHC-V | 8920-02 | Voltage: 0–100 mV humidity output |
| SK-RHC-I | 8920-03 | Current: 4–20 mA |
| SK-RHC-C | 8920-04 | Digital: RS-485 |
Signal Scaling and Connection
| Version | Temperature signal | Humidity signal |
|---|---|---|
| 8920-01 | −10 to 60°C = −100 to 600 mV | 0 to 100% RH = 0 to 1,000 mV |
| 8920-02 | −10 to 60°C = −10 to 60 mV | 0 to 100% RH = 0 to 100 mV |
| 8920-03 | −15 to 65°C = 4 to 20 mA | 0 to 100% RH = 4 to 20 mA |
| 8920-04 | RS-485 serial communication | 9,600 bps; 8 data bits; 1 stop bit; no parity |
Signal scaling does not extend the connected probe’s measuring range. For the voltage versions, temperature and humidity use different scaling. Confirm the receiving device’s input range and wiring before connection. For RS-485 integration, check the communication protocol as well as the electrical interface.
Specified output accuracy is ±0.3°C / ±0.3% RH for the voltage versions and ±1.0°C / ±1.0% RH for the current version. These are output-stage specifications; probe measurement accuracy is listed separately below.
Main Unit Specifications
| Specification | Details |
|---|---|
| Measurement range and accuracy | Depend on the connected SK-RHCS probe |
| Power supply | 12–14 VDC, or an optional AC adapter; confirm the rating on the supplied unit before wiring |
| Operating environment | −10 to 60°C; below 80% RH, without condensation |
| Refresh interval | 1 or 10 seconds, manually selectable |
| Alarm function | Relay contact; one upper OR lower threshold can be set for temperature and for humidity |
| Dimensions | 118 W × 100 H × 42 D mm |
| Weight | Approximately 220 g |
| Materials | ABS resin body and acrylic display window |
Compatible Temperature and Humidity Probes
All three probes use a thermistor for temperature and a polymeric resistive humidity sensor. Select the probe layout and accuracy that suit your measurement task.
SK-RHCS-1 Plug-in Probe
| Specification | SK-RHCS-1 |
|---|---|
|
|
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| Catalogue number | 8921-00 |
| Temperature range | −10 to 60°C |
| Humidity range | 20 to 95% RH at 23°C |
| Temperature accuracy | ±0.5°C at 20 to 30°C; ±1.0°C elsewhere within the measuring range |
| Humidity accuracy | ±3% RH at 30 to 90% RH and 20 to 30°C |
| Dimensions | 29 W × 121 H × 24 D mm, excluding protrusions |
| Weight | Approximately 42 g |
SK-RHCS-2 Remote Sensor Probe
| Specification | SK-RHCS-2 |
|---|---|
|
|
|
| Catalogue number | 8922-00 |
| Temperature range | −10 to 60°C |
| Humidity range | 20 to 95% RH at 23°C |
| Temperature accuracy | ±0.5°C at 20 to 30°C; ±1.0°C elsewhere within the measuring range |
| Humidity accuracy | ±3% RH at 30 to 90% RH and 20 to 30°C |
| Sensor dimensions | 19 mm diameter × 118.5 mm length |
| Cable length | 5 m; ask about manufacturer-supported extensions if required |
| Weight | Approximately 228 g |
SK-RHCS-3 Miniature Flexible Probe
| Specification | SK-RHCS-3 |
|---|---|
|
|
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| Catalogue number | 8922-10 |
| Temperature range | −10 to 60°C |
| Humidity range | 20 to 95% RH at 23°C |
| Temperature accuracy | ±0.7°C at 20 to 30°C; ±1.2°C elsewhere within the measuring range |
| Humidity accuracy | ±4% RH at 30 to 90% RH and 20 to 30°C |
| Sensor dimensions | 6 mm diameter × 35 mm length |
| Cable length | 1.5 m |
| Weight | Approximately 87 g |
Ordering and Installation Notes
- Specify the complete configuration: transmitter catalogue number, probe model and required power arrangement.
- Match the receiving equipment: check input type, scaling, grounding and isolation requirements, particularly for current-output wiring.
- Check the measurement conditions: humidity accuracy applies only within the stated temperature and humidity conditions.
- Arrange calibration documents: request the required calibration points and certificate when ordering. Calibration options depend on the probe and main-unit combination.
The earlier Seacom listing references AC adapter 7687-52. For an existing installation, provide the transmitter and adapter labels so we can confirm the appropriate supply option.
Related Temperature and Humidity Instruments
- Humidity and temperature transmitters for comparison with other fixed measurement options.
- Humidity meters and data loggers for spot checks or recording readings over time.
- Sato measuring instruments.
Need Help Selecting an SK-RHC Transmitter?
Contact Seacom Process Instruments Sdn Bhd with your temperature and humidity range, required output, probe location and receiving instrument model. For a replacement, include a photograph of the existing transmitter and probe labels.
16 other products in the same category:
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- Humidity accuracy up to ±0.8% RH
- Operating pressure from vacuum to 40 bar
- Adjustable insertion depth with two probe lengths
- Optional ball valve for insertion and removal under process conditions
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- Humidity accuracy up to ±0.8% RH
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- −70 to +180 °C probe-head measurement range
- Standalone Modbus RTU or Vaisala Indigo transmitter operation
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- ±0.1 °C accuracy at +20 °C
- Fast response time of less than 8 seconds
- 4–20 mA or Modbus RTU output options
- IP65 enclosure with traceable calibration certificate
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The Vaisala HMDW80 Series provides cost-effective humidity and temperature measurement for routine HVAC and building-automation applications.
- Humidity accuracy up to ±3% RH
- Wall, duct and outdoor installation models
- Current or voltage output configurations
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The Vaisala HMT140 Wi-Fi Data Logger has been discontinued and is no longer recommended for new monitoring systems.
- Primary replacement: Vaisala RFL100 with AP10 VaiNet Access Point
- Existing HMT140 installations can continue to be supported
- Migration should be checked against the existing sensor and input type
- Contact Seacom for replacement selection and viewLinc compatibility
The compact Vaisala HM40 Series provides reliable humidity and temperature spot checks for HVAC, construction, warehouses, laboratories, museums and industrial applications.
- Humidity accuracy up to ±1.5% RH
- HM41, HM42, HM45 and HM46 probe configurations
- Numeric, statistical and graphical trend displays
- Traceable calibration certificate included
The Vaisala GMW90 Series provides stable wall-mounted carbon-dioxide and temperature measurement, with optional humidity, for demanding HVAC and building-automation applications.
- Carbon-dioxide measurement from 0 to 5000 ppm
- CO₂ accuracy up to ±(30 ppm + 2% of reading)
- Temperature measurement from −5 to +55 °C
- Optional HUMICAP® relative-humidity measurement from 0 to 95 %RH
- Voltage, current or Modbus RTU output models
- Display and CO₂ status-indicator options
- Field-exchangeable calibrated measurement modules
- Traceable three-point CO₂ calibration certificate included
The Vaisala Origo10 Series comprises modular HVAC transmitters with interchangeable probes for humidity, temperature, CO2 and dew-point measurement.
Available with analog, Modbus RTU and BACnet MS/TP outputs, wall or duct mounting, an optional display and an IP65-rated enclosure.
The Vaisala HMP3 is a high-accuracy, field-maintainable probe for industrial HVAC, air-handling units, cleanrooms, paint booths and environmental chambers.
- Humidity accuracy up to ±0.8% RH
- Temperature measurement from −40 to +120 °C
- Field-replaceable filter and HUMICAP sensor option
- Standalone Modbus RTU or Vaisala Indigo transmitter operation
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- HMT331 wall mounting → HMP1 with Indigo500
- HMT333 ducts and tight spaces → HMP3 or HMP9 with Indigo500
- HMT334 high pressure and vacuum → HMP4 with Indigo500
- HMT335 high temperature → HMP5 with Indigo500
- HMT337 high humidity → HMP7 with Indigo500
- HMT338 pressurised pipelines → HMP8 with Indigo500
The Vaisala HMP4 provides high-accuracy humidity and temperature measurement in compressed air, breathing air, industrial gases, vacuum systems and other processes operating at pressures up to 100 bar.
- Operating pressure below 100 bar, including vacuum applications
- Humidity accuracy up to ±0.8% RH
- Temperature range from -70 °C to +180 °C
- Standalone Modbus RTU or connection to an Indigo transmitter
The EDL Practi-Cal Series provides dry-well and surface testing facilities for compatible temperature probes.
- PRI-1: Ambient to 350°C, aluminium block.
- PRI-2: Ambient to 650°C, brass block.
- Interchangeable wells and custom insert options.
- Provision for an independent reference probe.
- 0.1°C controller resolution.
- RS-232 interface and iTools software.
The Vaisala HMP7 is designed for continuously humid, rapidly changing and near-condensing environments. Probe heating helps prevent condensation while maintaining reliable process measurement.
- Humidity accuracy up to ±0.8% RH
- Probe heating for condensation prevention
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- Standalone Modbus RTU or Vaisala Indigo transmitter operation
The Vaisala HMP155 provides stable humidity and temperature measurement for automatic weather stations, road-weather systems, airports, research sites and demanding outdoor monitoring.
- Relative-humidity measurement from 0 to 100 %RH
- Operating range from −80 to +60 °C
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- HMP155D with RH voltage output and passive four-wire Pt100 temperature
- HMP155E with RS-485 digital output
- Optional warmed probe, chemical purge and additional temperature sensor
The Vaisala HMT360 Series was an intrinsically safe transmitter platform for humidity, temperature and moisture measurement in hazardous areas. It is discontinued and replaced by the Vaisala HMT370EX with an application-specific probe.
- HMT361 wall mounting → HMP371
- HMT363 ducts and confined spaces → HMP373
- HMT364 high pressure and vacuum → HMP374
- HMT365 high temperature → HMP375
- HMT367 high humidity → HMP377
- HMT368 pressurised pipelines → HMP378