S5 Fuel and Water Sender
Wema S5 Fuel and Water Senders are tried and tested over millions of units, decades of use and in almost every kind of application.
These senders are reliable and accurate giving customers the confidence to depend on our technology year after year. Fitted as original equipment by major British and European boat builders for over 40 years, and trusted by commercial vehicle, defence and agricultural manufacturers worldwide.
Manufactured from 316 stainless steel, the S5 works on the simple principle of twin magnets in the float tripping a series of reed switches, securely housed and doubly insulated inside the stainless tube.
The sender is passive and draws power from the gauge.
They are available in lengths from 150mm to 1600mm. Longer and custom lengths are available on request, including calibrated senders for odd-shaped tanks.
There are two standard resistance ranges:
- 0-190Ω — European specification
- 240-30Ω — American specification
Sender and gauge must have the same resistance range — or the gauge will read backwards, or not at all. European vs American resistance →
Output from the sender is usually resistance but voltage options (0-5V, 0-10V, 4-20mA) are also available in some sizes and as a special order item. Special orders may be subject to a minimum order quantity depending on the modification — contact us to discuss your requirements.
If your current sender has a voltage output then you will have 3 wires not 2. Three or four wires could also mean that you have a sender with a high or low level alarm so it's always best to check the product code on the ID plate before ordering. How to identify your sender →
The S5 bolts down to a 5-hole tank fitting using an SAE 5-hole drill pattern. The SAE 5-hole pattern covers most standard 5-hole fittings — check the dimensional drawing (image 2 above) against your tank before ordering. Centre hole is 40mm diameter, PCD is 54mm, bolts are M5.
If your tank has a different fitting pattern, we have flanges and adapters that may help. If unsure just ask.
Advancements in reed switch technology have allowed us to fit more switches inside the senders, giving the improved resolution required by modern digital displays.
For shallow tanks less than 400mm deep, high-resolution senders are available with approximately twice the number of switching points — a change of state approximately every 10mm instead of ~20mm in a standard resolution sender.
Wema S5 senders are suitable for diesel, petrol, fresh water, grey water, black water, hydraulic oil, AdBlue and ethanol.
Supplied with one flat nitrile gasket and 5 × M5 screws. If you are fitting to a petrol tank then a Viton gasket is recommended as ethanol content in modern fuels degrades nitrile over time. Viton gaskets available here →
The S5 can also be used as a position sensor by mounting the sender to a stationary part and clamping the float to a moving component. This is often used in industrial and agricultural machinery — a lifting trailer tailgate or a lifting keel on a yacht for example.
If you have an existing Wema sender, the identification plate on the head shows the product model, spec, length, Wema product code, output and batch code.
The code 001306 or 001305 stamped on the head indicates an S5. How to identify a replacement Wema sender →
If the S5 length or resistance you need is temporarily out of stock, we can usually supply an S3 sender with an FL-2 flange as an equivalent at the same price. Contact us to check.
Specifications
- Fitting: SAE 5-hole bolt-down (40mm centre hole, 54mm PCD, M5 bolts)
- Material: 316 stainless steel
- Output: 0-190Ω / 240-30Ω resistance (standard), or 0-5V / 0-10V / 4-20mA (custom)
- Lengths: 150–1600mm standard
- Working voltage: 12V or 24V (draws power from gauge)
- Max carrying current: 1.2A
- Max switching current: 0.5A, 10W
- IP rating: IP65
- Operating temp: -40°C to +85°C
- Torque: 1.7–2.0 Nm
How long should your sender be? → | How to measure a level sender → | Replacing a floating-arm sender? →
[Please note: the codes 001306 and 001305 refer to the S5 head]
Wema S5 Fuel and Water Senders are tried and tested over millions of units, decades of use and in almost every kind of application.
These senders are reliable and accurate giving customers the confidence to depend on our technology year after year. Fitted as original equipment by major British and European boat builders for over 40 years, and trusted by commercial vehicle, defence and agricultural manufacturers worldwide.
Manufactured from 316 stainless steel, the S5 works on the simple principle of twin magnets in the float tripping a series of reed switches, securely housed and doubly insulated inside the stainless tube.
The sender is passive and draws power from the gauge.
They are available in lengths from 150mm to 1600mm. Longer and custom lengths are available on request, including calibrated senders for odd-shaped tanks.
There are two standard resistance ranges:
- 0-190Ω — European specification
- 240-30Ω — American specification
Sender and gauge must have the same resistance range — or the gauge will read backwards, or not at all. European vs American resistance →
Output from the sender is usually resistance but voltage options (0-5V, 0-10V, 4-20mA) are also available in some sizes and as a special order item. Special orders may be subject to a minimum order quantity depending on the modification — contact us to discuss your requirements.
If your current sender has a voltage output then you will have 3 wires not 2. Three or four wires could also mean that you have a sender with a high or low level alarm so it's always best to check the product code on the ID plate before ordering. How to identify your sender →
The S5 bolts down to a 5-hole tank fitting using an SAE 5-hole drill pattern. The SAE 5-hole pattern covers most standard 5-hole fittings — check the dimensional drawing (image 2 above) against your tank before ordering. Centre hole is 40mm diameter, PCD is 54mm, bolts are M5.
If your tank has a different fitting pattern, we have flanges and adapters that may help. If unsure just ask.
Advancements in reed switch technology have allowed us to fit more switches inside the senders, giving the improved resolution required by modern digital displays.
For shallow tanks less than 400mm deep, high-resolution senders are available with approximately twice the number of switching points — a change of state approximately every 10mm instead of ~20mm in a standard resolution sender.
Wema S5 senders are suitable for diesel, petrol, fresh water, grey water, black water, hydraulic oil, AdBlue and ethanol.
Supplied with one flat nitrile gasket and 5 × M5 screws. If you are fitting to a petrol tank then a Viton gasket is recommended as ethanol content in modern fuels degrades nitrile over time. Viton gaskets available here →
The S5 can also be used as a position sensor by mounting the sender to a stationary part and clamping the float to a moving component. This is often used in industrial and agricultural machinery — a lifting trailer tailgate or a lifting keel on a yacht for example.
If you have an existing Wema sender, the identification plate on the head shows the product model, spec, length, Wema product code, output and batch code.
The code 001306 or 001305 stamped on the head indicates an S5. How to identify a replacement Wema sender →
If the S5 length or resistance you need is temporarily out of stock, we can usually supply an S3 sender with an FL-2 flange as an equivalent at the same price. Contact us to check.
Specifications
- Fitting: SAE 5-hole bolt-down (40mm centre hole, 54mm PCD, M5 bolts)
- Material: 316 stainless steel
- Output: 0-190Ω / 240-30Ω resistance (standard), or 0-5V / 0-10V / 4-20mA (custom)
- Lengths: 150–1600mm standard
- Working voltage: 12V or 24V (draws power from gauge)
- Max carrying current: 1.2A
- Max switching current: 0.5A, 10W
- IP rating: IP65
- Operating temp: -40°C to +85°C
- Torque: 1.7–2.0 Nm
How long should your sender be? → | How to measure a level sender → | Replacing a floating-arm sender? →
[Please note: the codes 001306 and 001305 refer to the S5 head]