A marine glass thermometer lives or dies on the protection around the tube, and this one carries its own. A glass tube with a printed scale sits inside a cast aluminum case, so spray, dust and the occasional knock land on the case instead of the glass. The sensing bulb is carried in a brass thermowell — stainless steel where the medium calls for it — and the thermowell is the part that threads into the pipe, tank or duct. Compact and rigid, the assembly is built for the vibration, shock and salt air of an engine room, and it behaves the same way bolted to a plant line.
There is no bracket, no stand and no remote display to wire in. The unit screws straight into the pipe or vessel wall through its thermowell, and the length of the upper body keeps the scale clear of pipe lagging so the reading stays visible after the line has been insulated — a small detail that decides whether a gauge gets checked on every round or only when something goes wrong.
The scale spans chilled cooling water at one end and steam or hot process lines at the other. Most shipboard cooling work sits near the cold end of that span, which is why the same unit is often chosen as a ship cooling system temperature measurement thermometer on seawater and fresh-water cooling headers, while boiler feed and hot-water lines use the upper part of the scale.
We supply this model as a marine thermometer supplier to chandlers, repair yards and plant maintenance teams. Before an order is packed we check the thread, the working range and the body shape against the point where the gauge will sit, because those three details decide whether a thermometer fits on the first attempt.
| Product Name | WLG Marine Metallic Protector Thermometer |
| Color | Gold |
| Weight | 250g |
| Length of upper body | 200mm ( or customized) |
| Temperature Range | -50-600℃ |
| Shape | Straight Line, 90 ° angle |
| Case Material | Aluminum casting with golden plating |
| Thermowell | Brass(Stainless Steel) |
| Thermosensitive Liquid | Blue exudate |
| Product Features | Price Concessions/Accurate Temperature Measurement/Widely Used |
| Applicable Industries | Hotels, Machinery Repair Shops, Manufacturing Plant, Food & Beverage Factory, Restaurant, Construction works , Energy & Mining, Other, Advertising Company |
The scale runs from -50 to 600 °C, wide enough for chilled cooling water, hot-water and lube-oil lines, boiler feed and steam in one body style. Rather than buying the whole span, tell us the band you actually work in — the scale can be built around your requirement, and a scale that covers only what you need is easier to read than a crowded one.
Read with the window square to your eye. Looking at the column from above or below shifts where it appears to meet the graduations, and on a finely divided scale that offset is easily larger than the change you are trying to detect. Contrast between column and scale matters as well when the only light comes from a bulkhead lamp behind you, and reading from the side of the window rather than straight on will cost you a division or more.
Accuracy for this class of thermometer is generally quoted as one to two scale divisions. What you see in service also depends on the ambient temperature around the case, the vibration of the line and the properties of the medium, so treat the reading as a practical indication rather than a laboratory value. A periodic check against a known reference — an ice-water bath at 0 °C, or a calibrated comparator — tells you whether the column still tracks; if it has shifted, replace the unit rather than adjusting your logs around it.
Lag is the other thing that affects what you record. Heat has to travel through the brass thermowell before the column moves, so a thermometer put into a line that has just changed duty will keep reading the old value for a while. Give it time to settle, then write the number down.
Buying instrumentation for a vessel or a plant usually comes down to matching the part to the job. Our team at Jiangmen Jiexi Machinery Equipment Co., Ltd. has worked with buyers worldwide since 2013, and we start before the order: confirming the range, thread, connection and mounting you need, checking a model or part number against the equipment on site, and saying plainly where a standard unit stops and custom work begins. After delivery we stay reachable for installation, commissioning and fault-finding, with quality control that includes two extra testing steps beyond industry standard.
A bimetal dial thermometer bends a coiled strip and moves a pointer; this one is a glass tube with a scale printed alongside the column, so the reading is direct. There is no pointer linkage to drift and no battery or wiring to maintain. The trade-off is glass, which is why the tube sits inside a plated aluminum case and a metal thermowell — a marine glass thermometer of this type is built to be read through the window, not handled roughly.
Yes — cooling and chilled-water lines sit well inside the thermometer's span, so the unit works in the comfortable middle of its scale rather than at an edge. The practical questions are the connection and the immersion depth, not the range. Where the unit is used as a ship cooling system temperature measurement thermometer, make sure the sensing part sits in flowing water rather than a dead leg, and turn the window toward the walkway.
The thread is matched to your tapping rather than guessed from a photograph of the old gauge. Send the thread size and standard, or a sketch of the connection, and we will confirm it before the unit is packed. If the old thermometer is still in place, measure across the thread and note whether it is tapered or parallel — that plus the pipe size is usually enough for us to identify it.
Yes. 200 mm is the standard upper body; other lengths can be made to order when the scale has to clear deeper lagging or reach a particular reading position. The range, scale and connection stay as agreed, so a longer body changes where the window sits, not how the unit is read.
Brass is the standard thermowell and suits most water, steam and oil service. Choose stainless steel where the medium is more aggressive, or where a brass thermowell would be attacked over time. Tell us what the line carries and we will confirm the material with the order.
