Hyoda AY Series Waterproof Bimetal Thermometers
The Hyoda AY Series provides local temperature indication using a bimetal sensing element and a dial mounted at the sensing stem. Its stainless steel exterior and IP65 enclosure suit installations requiring a protected mechanical temperature display.
Choose AY4 or AY5 for a standard head arrangement, or AY4-QS or AY5-QS when an adjustable viewing angle helps make the dial easier to read. Specify the temperature scale, stem dimensions and connection to suit the measurement point.
Compare AY Series Models
| Model | Dial diameter | Head arrangement | Protection |
|---|
| AY4 |
100 mm |
Standard |
IP65 |
| AY5 |
125 mm |
Standard |
IP65 |
| AY4-QS |
100 mm |
Adjustable angle |
IP65 |
| AY5-QS |
125 mm |
Adjustable angle |
IP65 |
Specifications and Ordering Options
| Specification | Details |
|---|
| Measuring principle |
Bimetal |
| Available range coverage |
−50 to 500°C; select a suitable standard scale |
| Function |
Temperature indication; no microswitch |
| Listed stem diameters |
8, 10 or 12 mm |
| Listed stem lengths |
85 to 500 mm |
| Listed construction |
SUS304 stainless steel; SUS316 on request, tempered glass and aluminium dial plate |
| Listed accuracy |
±1.5 to ±2.0% of full scale; special ±1.0% of full scale on request |
The range coverage does not mean every instrument has a −50 to 500°C scale. Stem, material and accuracy options depend on the selected configuration; confirm the complete specification before ordering. Accuracy expressed as a percentage of full scale is different from a percentage of the measured reading.
Product Pictures and Dimensions
Choosing the Right AY Thermometer
- Viewing position: check whether a standard head can be read easily after installation or whether a QS adjustable head is more practical.
- Dial size: choose 100 or 125 mm according to available space and reading distance.
- Temperature scale: provide the normal operating range and expected extremes.
- Stem and connection: confirm insertion length, stem diameter, mounting thread and any existing thermowell dimensions.
- Process conditions: specify the medium, pressure and material requirements so the installation can be checked.
- Remote indication or switching: consider the fluid-filled alternatives below if the dial must be separated from the sensing point or electrical contacts are required.
Compare All Six Hyoda Thermometer Listings
| Product / range | Instrument type | Display / arrangement | Indication / switching | Protection | Selection focus |
|---|
| M Series |
Fluid-filled; M3/M4/M6 and WP versions |
75 / 100 / 150 mm; remote bulb |
Optional pointer contacts; M3: one, M4/M6: one or two |
IP43; WP: IP65 |
Remote reading with a choice of dial sizes |
| S6 / S6-WP |
Fluid-filled |
150 mm; remote bulb |
Indication only or one/two pointer contacts |
IP43; WP: IP65 |
Large dial for remote temperature indication |
| AY Series |
Bimetal; AY4/AY5 and QS versions |
100 / 125 mm; stem-mounted; QS adjustable head |
Temperature indication |
IP65 |
Local reading at the sensing stem |
| KME-2 / KME-4 |
Fluid-filled; wall-mounted |
KME-2: with indicator; KME-4: without indicator |
One microswitch contact |
IP43 |
Temperature switching with or without local indication |
| ES-UT |
Liquid-filled; wall-mounted |
Remote sensing bulb |
One or two microswitch contacts |
IP65; published explosion-proof designation d2G4 |
Applications requiring a suitable explosion-protected controller; confirm approval suitability |
| Fluid-Filled Thermometer Range |
General range listing; multiple configurations |
Depends on selected model |
Depends on selected model |
Depends on selected model |
Explore other Hyoda temperature indication and control options |
The Fluid-Filled Thermometer Range is an overview listing, not a single model with one specification. Compare the exact model, temperature scale, sensing bulb, connection and mounting before ordering. S6 and M6 both have 150 mm dials, but this does not establish interchangeability.
Related Hyoda Thermometers
- S6 / S6-WP — Fluid-filled thermometer with a 150 mm dial, remote sensing bulb and a choice of IP43 or IP65 enclosure.
- M Series — Fluid-filled thermometers with 75, 100 or 150 mm dials, remote sensing bulbs and optional pointer contacts.
- KME-2 / KME-4 — Fluid-filled temperature controllers with one microswitch contact; KME-2 includes an indicator, while KME-4 has no indicator.
- ES-UT — Liquid-filled temperature controller with one or two microswitch contacts and an explosion-proof enclosure; confirm approval suitability for the installation.
- Fluid-Filled Thermometer Range — Explore other Hyoda configurations for temperature indication and control, selected according to the measurement and installation requirements.
Need Help Selecting an AY Series Thermometer?
Contact Seacom with your temperature range, dial size, stem diameter, insertion length and connection requirements. For a replacement, include photographs of the existing thermometer, model markings and mounting arrangement so we can help identify a suitable configuration.
