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ST50 Catalogue
Digital Thermohygrograph
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Sekonic ST-50M Digital Thermohygrograph — Discontinued
The Sekonic ST-50M digital thermohygrograph is discontinued. It combined temperature and humidity measurement with paper chart recording and SD-card storage.
- Paper records: consider the Sato Sigma II NSII-Q.
- Electronic records: consider the Sato SK-L754 temperature and humidity data logger.
- Centralised monitoring and alarms: consider Vaisala RFL100, AP10 and viewLinc.
Contact Seacom to match the replacement to your recording requirements. Features and accessories differ from the original ST-50M.
Sekonic ST-50M Digital Thermohygrograph — Discontinued and Replacement Options
The Sekonic ST-50M has been discontinued. This page is retained to help existing users identify their recorder, check legacy consumable references and select an alternative for temperature and humidity recording.
The ST-50M combined a temperature and humidity display, a continuous paper chart and SD-card data recording. The appropriate replacement depends on whether you need a visible paper record, downloadable electronic readings or a connected monitoring system.
Recommended Alternatives to the ST-50M
These are functional alternatives, not direct replacements with identical features or interchangeable accessories. If you need both an on-site paper trace and electronic records, tell us before selecting a replacement.
| Alternative | Recording method | When to consider it | Main difference from ST-50M |
|---|---|---|---|
| Sato Sigma II NSII-Q | Temperature and humidity on a rotating paper chart | Routine visual checks and paper filing | No SD-card logging; different chart format and consumables. |
| Sato SK-L754 | Electronic temperature and humidity records, with PC and microSD data transfer | Local recording, trend analysis and electronic record storage | No built-in chart printer; requires a compatible SK-L754 probe. |
| Vaisala RFL100 + AP10 with viewLinc | Networked monitoring, historical records and configurable alarms | Multiple rooms, warehouses, laboratories and controlled environments | Requires a configured monitoring system; no built-in paper chart mechanism. |
For Paper Records: Sato Sigma II NSII-Q
The Sigma II is a practical alternative when staff need to inspect and retain a physical temperature and humidity chart. It uses separate pens and a rotating drum, so its recording process differs from the ST-50M's folded chart paper.
- 7210-00: temperature scale −15 to 40°C and humidity scale 0 to 100% RH.
- 7211-00: temperature scale −10 to 50°C and humidity scale 0 to 100% RH.
- Select the correct chart for the recorder model and recording period.
- ST-50M charts, pens and remote sensors are not interchangeable with Sigma II accessories.
View Sato Sigma II thermohygrographs.
For Electronic Records: Sato SK-L754
The SK-L754 records temperature and humidity electronically, with capacity for 16,000 data records. Data can be transferred to a PC or copied to a microSD card, and the dedicated software supports graphing and CSV export.
- SK-L754-1 plug-in probe: −10 to 60°C and 5 to 95% RH.
- SK-L754-2 cabled probe: −20 to 80°C and 5 to 95% RH.
- A compatible probe must be selected separately; check the logger body's ambient limits as well as the probe range.
- The SK-L751 is a temperature-only logger. Choose SK-L754 when humidity must also be recorded.
The SK-L754 has no built-in paper chart printer. Its memory capacity and microSD workflow differ from the ST-50M, so select a recording interval and download schedule suitable for your required retention period.
View Sato SK-L750 Series data loggers.
For Centralised Monitoring: Vaisala viewLinc
For monitoring across several locations, consider Vaisala RFL100 data loggers with suitable humidity and temperature probes, AP10 access points and viewLinc software. The system combines historical records with configurable alarms and reporting.
This is a system upgrade for applications such as pharmaceutical storage, laboratories and controlled rooms. Seacom can help review measurement locations, network coverage, alarm requirements and calibration needs. The logger, probes, access point and software must be specified together.
View Vaisala RFL100, AP10 and viewLinc monitoring options.
What About the Sekonic ST-50A?
The ST-50A is being phased out and is not presented here as the preferred option for a new installation. Do not assume that an ST-50A provides the ST-50M's SD-card recording function. Contact Seacom if your existing procedure specifically requires a Sekonic chart recorder.
Original ST-50M Product Pictures
The following pictures identify the discontinued recorder.
ST-50M Legacy Specifications
Historical specifications are provided for identification and replacement planning. They do not describe the alternative products above.
| Specification | ST-50M legacy reference |
|---|---|
| Measurements | Temperature and relative humidity |
| Standard measurement conditions | −20 to 50°C; 20 to 90% RH, non-condensing |
| With sensor extension cable | −20 to 80°C; 0 to 100% RH, non-condensing; recorder body must remain within its own operating limits |
| Temperature accuracy | ±1.0°C at 0 to 50°C |
| Humidity accuracy | ±3% RH at 25°C; guaranteed humidity accuracy range 10 to 90% RH |
| Display resolution | 0.1°C and 0.1% RH |
| Chart | Z-fold paper, 113 mm wide × 12 m long; 100 mm working recording width |
| Memory card | SD card, 128 MB to 2 GB; SDHC cards of 4 GB or greater are not supported |
| Power | Four LR20 1.5 V batteries; 9 V DC, 500 mA adapter input |
| Dimensions and weight | 300 W × 245 H × 105 D mm; approximately 2.1 kg without batteries |
Existing ST-50M Charts, Pens and Accessories
These references were listed for the original recorder. Send the existing part number or a photograph for a compatibility and availability check; listing a reference does not confirm current stock.
| Item | Legacy reference | Details |
|---|---|---|
| Standard chart paper | HE12 / HE0140010 / HEGA | Original listing: 5 pieces per set |
| Clean chart paper | HE11 | Original listing: 5 pieces per set |
| Cartridge pens | HE13 / HEFA15330 / HEFA | Original listing: 2 red and 2 blue pens per set |
| Sensor extension cable | HE04 | 5 m |
| Sensor extension cable | HE05 | 20 m |
| Sensor extension cable | HE06 | 50 m |
| External control output unit | HE09 | Original listing: one common output |
See chart paper and recording consumables and recording pens, ink and ribbons for related enquiries.
Need Help Replacing an ST-50M?
Send Seacom Process Instruments Sdn Bhd your recorder model, temperature and humidity range, measurement location and required recording period. Let us know whether you need paper charts, memory-card downloads, remote alarms or centralised monitoring, and include any existing chart, pen or sensor references you need to retain.
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The Sato Thermohygrograph Sigma II NSII-Q continuously records temperature and relative humidity on an easy-to-read paper chart, providing a visible record without requiring a computer or network.
- Temperature ranges of −15 to +40 °C or −10 to +50 °C
- Relative-humidity range from 0 to 100 %RH, non-condensing
- Selectable 1-day, 7-day or 32-day chart rotation
- Transparent cover allows the chart to be viewed while closed
- Battery-powered quartz clock with no external supply required
- Suitable for warehouses, laboratories, clean areas and production rooms
The Sekonic ST-50A displays temperature and relative humidity and records both on a continuous paper chart.
- Electronic temperature and humidity sensing with LCD display.
- Optional extension cables for remote sensor placement.
- Battery operation or a suitable external DC supply.
- Desktop or wall-mounted installation.
Being phased out: confirm availability before ordering. Alternatives include the Sato Sigma II for paper records, Sato SK-L754 for electronic logging and Vaisala viewLinc for centralised monitoring.
16 other products in the same category:
The Sato SK-L400T measures and records temperature from up to four Type K thermocouple probes, with all four readings shown on a large backlit display.
- Four temperature channels for comparing multiple measurement points.
- SD-card recording with intervals from 1 second to 90 minutes.
- Independent high and low alarms for each channel.
- MAX/MIN, relative readings and T1–T2 temperature difference.
- Battery operation with an optional AC adapter.
- Probes sold separately; measuring range depends on the selected probe.
The Isuzu TH27R paper temperature and humidity recorder has been discontinued and is no longer recommended for new installations. Seacom continues to support existing instruments with selected chart papers and recording pens.
- Legacy temperature range from −20 to +50 °C
- Relative-humidity range from 0 to 100 %RH
- Quartz-driven cylindrical paper-chart recorder
- Replacement TH27R chart papers and cartridge pens remain available
- Existing recorder and chart details must be confirmed before ordering
- Closest current substitute: Sato Sigma II NSII-Q thermohygrograph
Dickson round chart recorders provide a visible paper record of temperature or temperature and humidity for routine inspection and filing.
- 3-inch SC3: compact temperature recorder
- 4-inch SL4: temperature recorder with digital display
- 8-inch KT8: temperature recording with sensor and channel options
- 8-inch TH8: temperature and relative humidity recording
- Replacement selection assistance for older KT6, TH6, KT8P, KT856 and TH8P models
Send your existing model number, measurement range and chart reference so we can help identify a suitable configuration.
DeltaTrak in-transit temperature loggers and recorders document temperature conditions during shipment.
- 16000 Series: disposable paper chart recorders with model-dependent recording periods from 5 to 90 days.
- FlashLink Mini PDF: single-use electronic logger with USB PDF and CSV reports.
- Choose according to shipment duration, temperature range and the receiving team's record requirements.
The DicksonOne TWP provides local touchscreen viewing and cloud-connected monitoring of temperature, relative humidity or differential pressure. Its replaceable sensor system simplifies calibration and supports different monitoring applications using the same logger platform.
- Large 8-inch LCD touchscreen
- WiFi, Ethernet and Power over Ethernet connectivity
- Approximately 1,000,000 sample-point backup capacity
- Up to 70 hours of rechargeable battery backup
- Replaceable temperature, humidity, thermocouple, RTD and differential-pressure sensors
- Phone, text and email alarms through a DicksonOne subscription
The Vaisala DL2000 combines precision temperature and relative-humidity monitoring with optional analog or door-contact inputs for viewLinc systems.
- Scheduled for future discontinuation; confirm availability before specifying
- Current replacement platform: Vaisala VDL200 with suitable smart probes
- Internal temperature and relative-humidity measurement
- Optional current, voltage or Boolean input configurations
- Onboard memory and a typical 10-year battery life
The Sato Thermohygrograph Sigma II NSII-Q continuously records temperature and relative humidity on an easy-to-read paper chart, providing a visible record without requiring a computer or network.
- Temperature ranges of −15 to +40 °C or −10 to +50 °C
- Relative-humidity range from 0 to 100 %RH, non-condensing
- Selectable 1-day, 7-day or 32-day chart rotation
- Transparent cover allows the chart to be viewed while closed
- Battery-powered quartz clock with no external supply required
- Suitable for warehouses, laboratories, clean areas and production rooms
The Sato SK-L750 Series provides portable, configurable recording for temperature or temperature and humidity, with interchangeable probes, local display, USB communication and microSD data transfer.
- SK-L751: two-channel temperature data logger
- SK-L754: one temperature and one relative-humidity channel
- 16,000 stored readings per channel
- Four recording modes and 14 selectable logging intervals
- USB real-time monitoring and CSV data export
- AA-battery operation with optional AC-adapter power
The Anritsu AM-8000 Series is discontinued and has been replaced by the AM-9000 Series.
For a replacement, select the appropriate channel count, thermocouple input configuration and recording interval.
- 6-channel and 12-channel replacement options.
- Fixed thermocouple-type or multi-input models.
- USB communication and optional AMS-950 analysis software.
- Confirm existing probe, connector and accessory compatibility.
The Vaisala VDL200 is a secure Power-over-Ethernet data logger for monitoring temperature, relative humidity, carbon dioxide and analog or Boolean inputs in controlled and GxP-regulated environments.
Designed for the Vaisala viewLinc Continuous Monitoring System, the VDL200 combines interchangeable smart probes, onboard memory and battery backup to provide reliable, gap-free environmental monitoring.
The Sekonic SP-100 is a portable universal 6-channel chart recorder for temperature and process signals.
- Thermocouple, Pt100, DC voltage and 4–20 mA inputs.
- Colour chart recording with configurable ranges and scaling.
- Selectable chart speeds and recording formats.
- Optional memory-card recording.
Discontinued model. Contact Seacom for availability, pricing and configuration details.
The Sato Mini-Cube 7008-10 records temperature and relative humidity on a seven-day paper chart for routine inspection and filing.
- Temperature range: −15 to 40°C.
- Humidity range: 5 to 100%RH, non-condensing.
- Quartz-controlled seven-day chart rotation.
- Replaceable cartridge pens.
- Powered by one AA zinc-carbon battery.
- Supplied with 55 sheets of seven-day chart paper.
The Anritsu AM-9000 Series records temperature from six or twelve thermocouple channels in one portable instrument. Choose a fixed thermocouple-type model or a flexible multi-input model for temperature and DC-voltage measurement.
- Choice of 6-channel or 12-channel instruments
- Fixed thermocouple-type and multi-input versions
- Supports E, K, J, T and R thermocouples according to model
- 120,000 measurement-data memory
- USB 2.0 Micro-B communication for data transfer
- Battery operation or optional AC adaptor
- Optional AMS-950 software for PC analysis
The Vaisala RFL100 uses secure, long-range VaiNet wireless technology to monitor temperature, relative humidity and carbon dioxide with the AP10 Access Point and viewLinc Continuous Monitoring System.
- At least 50 m typical indoor wireless range
- Up to 32 RFL100 data loggers per AP10
- 30 days of local measurement memory
- Approximately 18 months of battery operation for temperature and humidity monitoring
The Sato SK-L200TH II temperature and humidity data logger is discontinued. The replacement is the Sato SK-L754, selected with a compatible temperature and humidity probe.
- Electronic temperature and humidity recording.
- 16,000 stored readings per channel.
- USB communication and microSD data transfer.
- Choice of plug-in or cabled probe, purchased separately.
The Sato Mini-Alpha 7006-00 is a compact thermohygrograph that records temperature and relative humidity on a seven-day paper chart.
- Temperature range: −15 to 50°C.
- Humidity range: 10–100% RH.
- Quartz drum drive powered by one AA battery.
- Desktop or wall-mounted use; approximately 0.8 kg.
- Replaceable chart paper and cartridge pens.