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『Elster S130 Hot Water Meter Flow Rates Pressure Loss Data Sheet and Performance Curves』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)
Elster S130 Hot Water Meter Flow Rates Pressure Loss Data Sheet and Performance Curves
Quick Answer: The Elster S130 hot water meter is a mechanical impeller meter for closed hot water circuits. It covers DN15 to DN50 and common permanent flow rates from 0.6 to 15 cubic meters per hour. Use the Elster S130 Hot Water Meter Flow Rates Pressure Loss Data Sheet and Performance Curves to check pressure drop at your actual flow before you pick a meter size.
Why the S130 Data Sheet Matters for Sizing
Most engineers skip this part. The data sheet gives more than flow rates. It shows pressure loss at different flows, temperature limits, mounting position, and accuracy bands. In practice a meter selected only by pipe size often runs outside the stable accuracy range. We have seen this on customer sites in Vietnam and the Philippines where a DN25 meter was installed on a low load circuit and the mechanical register barely moved.
The hot water meter is built for water up to 130 °C depending on the version. For closed hot water systems with glycol mixes, check the concentration first. A 30 percent glycol mix at 60 °C can have viscosity above 2 cP, and that changes low flow response. The S130 is not a steam meter. Do not use it on flash steam or two phase flow.
Flow Rates for the Elster S130 Hot Water Meter
The S130 family is generally split by permanent flow rate Qp. Common sizes include DN15 Qp 0.6 and Qp 1.5, DN20 Qp 2.5, DN25 Qp 3.5, DN32 Qp 6, DN40 Qp 10, and DN50 Qp 15. These values vary by regional version and approval. Always confirm the meter body length and thread type because Asian and European installations often use different connection standards.
For a district heating branch with a heat load of about 70 kW and a delta T of 20 Kelvin, the design flow is roughly 3 cubic meters per hour. A DN25 S130 with Qp 3.5 works close to its best range. But if the same line has only a 10 kW load at night, the flow can fall below the minimum reading threshold. That is why you should check Qmin on the data sheet, not just Qp.
In practice the S130 offers good repeatability down to about Qmin but the accuracy curve is not flat. Below the lower limit, the register may not count at all. For a commercial building in Malaysia with highly variable hot water demand, we often recommend an electromagnetic flow meter instead if low flow cut off is a concern.
Pressure Loss and Performance Curves
Pressure loss is a key point. The S130 performance curve shows head loss increasing with the square of flow rate. At Qp, pressure loss can be around 0.1 to 0.25 bar depending on meter size. At overload flow Qs, pressure loss may reach 0.4 bar or more. That number is small compared with a pump head of 3 to 5 bar, but it matters when the pump already operates near its curve limit.
Here is the thing. A hot water meter installed in a narrow plant room sometimes replaces a longer spool piece. The meter pressure drop plus fittings and valves can add 0.3 to 0.6 bar to a secondary loop. If the pump was selected with a margin of only 0.5 bar, you have a problem. We have seen this in district cooling plants in the Middle East where the mechanical room is tight and the piping has many elbows.
Use the pressure loss curve from the Elster S130 data sheet at the actual operating flow, not the maximum flow. Most closed hot water loops run at 60 to 80 percent of design flow for most of the year. So the real pressure loss is often lower than the value at Qp. But if you are checking a flushing bypass or a peak load condition, use the highest expected flow.
Installation and Application Notes
The S130 hot water meter is normally supplied with a mechanical register and can be mounted horizontally or vertically depending on the model. In horizontal lines, keep the register face horizontal or upright. Do not install the meter with the register facing down because air bubbles can collect in the measuring chamber and cause counting errors.
Use strainers upstream if the system has debris. In older heating systems in Latin America, we often see magn
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Temperature limits matter. The standard S130 is designed for hot water, not saturated steam. If the flow medium is superheated water above 130 °C or a thermal oil, choose a different meter. Silver Automation Instruments can supply vortex flow meters and Coriolis mass flow meters for those higher temperature applications. For steam, use a vortex flow meter with kg/h output.
The base S130 is mechanical. Some versions may have a pulse output for building management systems. If you need 4-20 mA or Modbus, check the output option before ordering because many stock models only have a local register.
Reading the Data Sheet and Performance Curves in a Real Quote
A common question from OEMs and panel builders is whether the S130 can be used for billing. The answer depends on local approval. In many countries the S130 is available with MID or national type approvals for hot water metering. If you need a meter for billing, state this clearly in the request for quote. A non approved meter costs less but may fail the local utility audit.
When you send an enquiry for an S130 replacement, include the following data. Pipe size DN, connection type and thread standard, permanent flow rate Qp, operating flow range, return temperature in °C, maximum pressure in bar, and whether the meter is for billing or process monitoring. This helps us check the correct S130 model and the corresponding pressure loss curve.
Also send a photo of the existing meter nameplate if you have one. The S130 nameplate shows the meter class, Qp, body length, and approval marks. A clear photo reduces quoting errors.
S130 Data Sheet Reference Points
Typical S130 data sheet parameters include Qmin, Qt, Qp, Qs, pressure loss at Qp, maximum admissible pressure, and temperature class. For example, a DN20 S130 may have Qmin around 0.03 cubic meters per hour, Qt around 0.075, Qp 2.5, and Qs 5. The exact values depend on the model and metrology class. Do not copy values across sizes without checking the data sheet.
The performance curves are usually presented as bar against cubic meters per hour. Some curves also show the accuracy envelope as a percentage from Qmin to Qs. The accuracy band for hot water meters can be wider at low flow and tighter in the upper range. That is normal for mechanical meters.
FAQ
What flow rates does the Elster S130 cover? The S130 is commonly available from DN15 to DN50 with permanent flow rates from 0.6 to 15 cubic meters per hour depending on the meter size.
Where can I find the S130 pressure loss curve? The pressure loss curve is in the Elster S130 hot water meter flow rates pressure loss data sheet and performance curves document. It shows pressure drop in bar against flow rate for each meter size.
Can the S130 be used for cold water? The S130 can measure cold water in many cases, but it is optimized for hot water and closed heating circuits. Check the data sheet for the approved temperature range.
Does the S130 require straight upstream pipe? Mechanical impeller meters are less sensitive than electromagnetic meters, but avoid placing the S130 directly after a valve or pump if you need billing accuracy. Follow the straight run recommendation in the data sheet.
Can Silver Automation Instruments supply a replacement S130? Yes. Send your pipe size DN, flow range, pressure in bar, temperature in °C, and connection type. We will confirm the S130 model and pressure loss against your pump curve.
Contact Silver Automation Instruments for S130 hot water meter selection, price, and delivery. Tel: +86-135-1213-1526, Whatsapp: 86-135-12131526, WeChat: +86 13512131526. Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range. We will check the S130 pressure loss curve against your pump head.