Monnit ALTA Wireless Humidity (RH) Sensor allows you to accurately monitor the relative humidity of the air within a room or enclosure. - Measures relative humidity, temp
Sekonic ST-50M Thermohygrograph with SD Card Recording – Discontinued
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The Sekonic ST-50M thermohygrograph records temperature and relative humidity on paper charts and an SD memory card. Its digital display provides local readings, while recorded electronic data can be reviewed on a computer.
Discontinued: The ST-50M is no longer available as a new instrument. This page provides reference information, consumable part numbers and alternative recording options.
- Paper recording: Sato NSII-Q thermohygrograph.
- Electronic data logging: Sato SK-L754 temperature and humidity data logger.
- Connected monitoring: Dickson OCEAView environmental monitoring system.
The Sekonic ST-50M temperature and humidity recorder combines a visible paper chart with electronic records stored on an SD memory card. It was designed for users who needed physical environmental records together with data for computer review.
This model is discontinued and is no longer available as a new instrument. The information below supports existing installations and helps users select consumables or an alternative recording system.
Paper charts and electronic records
Separate pens record temperature and humidity on folded chart paper, while the digital display shows current readings. SD-card recording provides an additional electronic history in CSV format for review using compatible spreadsheet software.
- Two-colour paper record: Red for temperature and blue for relative humidity.
- Electronic data storage: Recorded readings can be transferred from the SD card to a computer.
- Remote sensor positioning: Optional extension cables allow the sensor to be located away from the recorder.
- Local operation: Check readings and adjust settings at the instrument.
Unlike the paper-recording ST-50A, the ST-50M includes SD-card memory recording. When selecting an alternative, confirm whether your team still requires both paper and electronic records.
SD-card recording reference
| Recording media | SD memory card, 128 MB to 2 GB |
|---|---|
| File format | CSV: comma-separated text data |
| Selectable recording intervals | 1, 1.5, 3, 5, 6, 10, 12, 15, 30 or 60 minutes |
| File organisation | Daily or monthly recording files; maximum 512 files |
| Paper recording | Separate temperature and humidity traces on folded chart paper |
| Sensor extension options | 5 m, 20 m or 50 m cables |
Memory-card compatibility: Use the card type and capacity specified in the instrument manual. Higher-capacity SDHC and SDXC cards should not be assumed compatible. Confirm settings against the manual supplied with your instrument.
Consumables, spare parts and accessories
Existing ST-50M users can enquire using the references below. Availability of consumables and spare parts is checked separately from the discontinued recorder.
| Item | Part number / reference | Description |
|---|---|---|
| Standard chart paper | HE12 / HEGA / HE0140010 | Standard folded recording paper; 5 books per pack. |
| Clean chart paper | HE11 | Clean-paper version; 5 books per pack. |
| Recording pen set | HE13 / HEFA / HEFA15330 | 4 pens per set: 2 red for temperature and 2 blue for humidity. |
| Temperature and humidity sensor | HEAA | Replacement sensor assembly. Provide the recorder serial number and existing sensor details. |
| 5 m sensor extension cable | HE04 | For locating the sensor away from the recorder. |
| 20 m sensor extension cable | HE05 | For locating the sensor away from the recorder. |
| 50 m sensor extension cable | HE06 | For locating the sensor away from the recorder. |
| External alarm relay output unit | HE09 | One common alarm output; requires a compatible AC adapter. |
| AC adapter | Confirm according to supply voltage | Specify the mains voltage and plug type so the correct adapter reference can be checked. |
Multiple references are shown where alternative codes appear in our ST-50 series listing. For repeat orders, provide the reference printed on the existing packaging or a photograph of the chart, pen or component.
Replacement options for the Sekonic ST-50M
Choose an alternative according to how readings will be recorded, reviewed and retained. The following instruments offer different approaches and are not direct interchangeable replacements.
| Your requirement | Alternative | Selection guidance |
|---|---|---|
| Continue using paper charts | Sato NSII-Q thermohygrograph | For visible temperature and humidity records on a rotating drum chart. Select the appropriate temperature range and 1, 7 or 32-day recording period. This option does not replace the ST-50M's SD-card function. |
| Move to electronic data logging | Sato SK-L754 temperature and humidity data logger | For stored readings that can be transferred to a computer for review and analysis. Specify the SK-L754 within the SK-L750 series and select a suitable temperature and humidity probe. It does not produce a paper chart. |
| Monitor multiple locations with alerts | Dickson OCEAView environmental monitoring system | For central monitoring of rooms, storage areas or equipment using compatible wireless loggers and sensors. Hardware, software and notification services are selected according to the installation and monitoring requirements. |
Planning your replacement
- Record format: Decide whether you require paper charts, electronic files or both.
- Measurement conditions: Specify the temperature and humidity ranges and sensor locations.
- Monitoring coverage: Confirm the number of rooms, cabinets or measurement points.
- Alarm requirements: Identify whether staff need local indication or remote notifications.
- Documentation: Include calibration, reporting and record-retention requirements.
Consumable and replacement enquiries
Contact us for pricing and availability. For ST-50M consumables, quote the part number and quantity. For spare parts, include the serial number and a photograph. For an alternative recorder, describe the measurement conditions and the type of records your team needs.
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The Sekonic ST-50M thermohygrograph records temperature and relative humidity on paper charts and an SD memory card. Its digital display provides local readings, while recorded electronic data can be reviewed on a computer.
Discontinued: The ST-50M is no longer available as a new instrument. This page provides reference information, consumable part numbers and alternative recording options.
- Paper recording: Sato NSII-Q thermohygrograph.
- Electronic data logging: Sato SK-L754 temperature and humidity data logger.
- Connected monitoring: Dickson OCEAView environmental monitoring system.
16 other products in the same category:
Monitor four measurement points with the Sato SK-L400T 4-channel temperature data logger. Connect Type K thermocouple probes, view all four readings together and record temperature data to an SD card.
- Four-channel display: Compare temperatures on one backlit LCD.
- Flexible recording: Select logging intervals from 1 second to 90 minutes.
- Channel alarms: Set individual upper and lower temperature limits.
- Probe selection: Thermocouple probes are purchased separately.
The Sato SK-L200THIIα temperature and humidity datalogger is discontinued and has been replaced by the Sato SK-L750 series. For recording both temperature and relative humidity, select the SK-L754 with a suitable probe.
- Existing equipment: Also identified as SK-L200THIIa or SK-L200THII alpha.
- Temperature and humidity replacement: SK-L754.
- Temperature-only alternative: SK-L751.
- Probe selection: Specify the required measurement range and sensor position when replacing your logger.
The Sato SK-L750 series data loggers record temperature or temperature and humidity for later review on a PC. Choose the SK-L751 for two-channel temperature measurement or the SK-L754 for combined temperature and humidity recording.
- Memory: 16,000 readings per channel.
- Recording intervals: 14 selectable settings from 1 second to 90 minutes.
- Data transfer: USB connection and copying logged data to microSD.
- Software: Data analysis and real-time PC transmission software included.
Sato compact type thermohygrograph Mini-Cube 7008-00 fits almost anywhere at your convenience.
One box of 7 day charts included.
(Measuring range: -15 to 40°C 5 to 100%)
The Dickson TWP touchscreen data logger displays readings and measurement history on an 8-inch colour screen. Configure it for temperature, humidity or differential pressure monitoring using compatible replaceable sensors.
- Local monitoring: Touchscreen display with audible and visual alarms.
- Data access: USB download and Wi-Fi/Ethernet connectivity.
- Remote monitoring: DicksonOne cloud access and notification features require the appropriate subscription.
The Sato SK-RHC-I temperature and humidity transmitter combines a local display with 4–20 mA outputs for connection to compatible monitoring and control equipment. Three interchangeable probe designs support different sensor positions.
- Dual measurement: temperature and relative humidity.
- Probe choice: plug-in, remote cable or slim remote sensor.
- Alarm relay: selectable upper or lower threshold for each parameter.
Probe sold separately. An optional AC adapter is available.
Dickson circular chart recorders provide a paper record of temperature, humidity, pressure or external transmitter signals, depending on the model. Select the recorder by measurement type, chart size, recording period and installation requirements.
- Temperature and humidity: KT8 and TH8 models for temperature-only or combined temperature and relative humidity recording.
- Pressure: PW4 and PW8 families with 4-inch or 8-inch circular charts.
- Universal input: Legacy ET855 recorder information for existing voltage and current signal installations.
- Replacing an older recorder? Refer to the model comparison below before ordering a replacement or consumables.
The Sato NSII-Q Sigma II thermohygrograph records temperature and relative humidity together on a rotating paper chart. Its quartz-driven mechanism provides a visible measurement history for routine environmental checks.
- 7210-00: temperature range -15 to 40°C.
- 7211-00: temperature range -10 to 50°C.
- Humidity: 0 to 100% RH, non-condensing.
- Recording periods: selectable 1, 7 or 32 days.
The Evikon E2244 humidity and temperature transmitter measures relative humidity and air temperature for connection to controllers, monitoring instruments and building management systems.
- Measurements: Relative humidity and temperature in air and non-aggressive gases.
- Analog outputs: 2 × 4–20 mA and 2 × 0–10 V.
- Construction: IP65-rated enclosure.
- Mounting: E2244 wall-mount and E2244-DM duct-mount versions.
Palmer Wahl pressure and temperature chart recorders provide a paper record of measurements over time. Choose an 8-inch or 12-inch recorder with an aluminium or Pelican® case, configured for pressure, temperature or combined recording.
- Recording options: Up to three pens, depending on configuration.
- Chart drives: Battery-operated, with spring-wound and electric options available.
- Installation: Portable and fixed-mount configurations.
The Anritsu AM-9000 series temperature datalogger records measurements across 6 or 12 channels, with fixed thermocouple and multi-input models available. Store readings in internal memory and transfer them to a PC through USB using optional AMS-950 analysis software.
- Choose your configuration: AM-9000, AM-9100, AM-9200 or AM-9300.
- Recording capacity: 120,000 readings.
- Power options: AA batteries or an optional AC adapter.
AMS-950 software is sold separately.
Monnit ALTA Soil Moisture Sensor measures soil moisture tension & soil temperature within the soil. It uses a resistive granular matrix element to accurately measure the matric water potential (soil moisture tension) in the soil and a thermistor based temperature element to measure temperature.
- Safe to use in both hot & freezing temperatures
- Reports matric potential (soil water tension)
- Moisture readings in centibar & kPa
- 0 to 240 centibar (kPA)
- Will not dissolve in soil
- Internally compensated for commonly found salinity levels
- Easy to install and use compared to traditional tensiometers
- Stainless steel electrodes
- No maintenance required
- Temperature readings in C/F.
- 5 ft removable lead
Sekonic Universal 6 channel Recorder SP-100 / SP100 records from different sources simultaneously, including mA, V, PT100, Thermocouple.
Dickson OCEAView™ brings wireless environmental monitoring, alarm notifications and traceable records into one platform. Monitor temperature, humidity and other critical parameters using compatible data loggers and sensors for refrigerators, freezers, laboratories, pharmaceutical storage and cold rooms.
- Connected monitoring: LoRaWAN and Bluetooth logger options for fixed equipment and mobile applications.
- Actionable alerts: Email, SMS and voice notification options for excursions and technical alarms.
- Traceable records: Audit trails, measurement history and reporting tools.
- Deployment choice: Cloud or on-premises software.
The Sekonic ST-50A digital thermohygrograph combines an electronic temperature and humidity display with continuous paper chart recording. View current conditions and retain a physical record for environmental checks.
- Paper records: Temperature and humidity recorded together.
- Local display: Check readings directly at the instrument.
- Remote sensor positioning: Optional extension cables up to 50 m.
- Existing installations: Chart paper, replacement pens and sensor enquiries.
Discontinued model: Manufacturer sales have ended. Remaining stock, consumables and alternative instruments are subject to availability.