Crompton Potentiometer Manufacturer,Supplier and Exporter in India
Product Code : EL-SI-8122
Jlab Export is a leading Crompton Potentiometer Manufacturer,and suppliers in India
Crompton Potentiometer (code EL-SI-8122) is a panel potentiometer of the Crompton pattern for measuring emf and potential difference in college physics and electrical measurement labs. It works at a current of the order of 125 mA set with coarse and fine rheostats, each slide-wire division equals 1/2 mV, and a self-standardisation circuit is built in. It is made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Type | Crompton-pattern potentiometer with voltage dials and a slide wire |
| Working current | Of the order of 125 mA |
| Current adjustment | Coarse and fine rheostats |
| Slide-wire division | 1/2 mV (500 microvolts) per division |
| Panel terminals | For a 2 V battery, the galvanometer and the standard cell |
| Standardisation | Self-standardisation circuit built in |
| Quality check | Each potentiometer is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-SI-8122 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How Does It Compare with Other JLab Potentiometers?
| Model | Measuring elements | Current setting and standardisation | Panel and contact |
|---|---|---|---|
| This Crompton potentiometer (EL-SI-8122) | Voltage dials and slide wire; 1/2 mV per slide-wire division | Coarse and fine rheostats; about 125 mA; built-in self-standardisation circuit | Terminals for a 2 V battery, galvanometer and standard cell |
| Potentiometer Dial Pattern | 10, 14 or 22 dial coils plus a 50 cm slide wire in 500 parts | Not listed | Battery, galvanometer and test-circuit terminals; thick knife-edge jockey |
| Potentiometer with Pencil Jockey | Four constantan wires, one metre long (ten-wire model also listed) | Not listed | Lock-type brass terminals; pencil jockey with lead |
Choose the Crompton potentiometer for electrical measurement work where readings are taken directly from the voltage dials and slide wire after standardisation. The dial pattern is the simpler teaching instrument for introducing emf measurement, and the wire board suits the classic class 12 metre-wire practicals.
What Is the Crompton Potentiometer Used For?
The Crompton potentiometer is the laboratory form of the DC potentiometer used in electrical measurement courses. Its working current is first standardised against a standard cell: with the cell connected at its terminals, the coarse and fine rheostats are adjusted until the galvanometer shows no deflection. After that, an unknown emf or potential difference is balanced on the voltage dials and slide wire and read directly from their settings, with no current drawn from the source at balance. With the slide wire divided in steps of 1/2 mV, small potential differences can be resolved finely.
Typical uses in degree and diploma labs are calibrating voltmeters and ammeters (the ammeter current is measured as the voltage across a standard resistance), measuring thermocouple emfs, and comparing resistances from their voltage drops. Higher voltages are measured through a volt ratio box, which divides them down to the potentiometer’s range. Re-check the standardisation from time to time during a long session, and open the battery circuit when the instrument is not in use so the working current does not drift as the battery runs down.
What to Specify When Ordering
- Quantity — the minimum order is 10 units.
- Range extension — add a volt ratio box if you will calibrate meters above the potentiometer’s own range.
- Working items — 2 V battery or accumulator, galvanometer and standard cell are separate items and can be quoted together.
- Range or dial layout — if a tender states them, include the wording so JLab can confirm before quoting.
Frequently Asked Questions
What does one slide-wire division represent?
Each division equals 1/2 mV, that is 500 microvolts, once the working current has been standardised.
What working current and battery does it use?
The working current is of the order of 125 mA, adjusted with the coarse and fine rheostats. Panel terminals are provided for a 2 V battery.
How is the potentiometer standardised?
It has a built-in self-standardisation circuit, used with a standard cell connected at its terminals: the rheostats are set until the galvanometer reads zero. Ask JLab to confirm the exact standardising steps for the dial setting of your unit.
Can it measure voltages higher than its own range?
Yes, with a volt ratio box. JLab lists a Volt Ratio Box made for extending the range of the Crompton potentiometer; it is a separate item.
Are the galvanometer, battery and standard cell included?
They are not part of this listing. The panel has terminals for all three, and each is available separately from JLab.
What should an export enquiry include?
The quantity, destination country and port or city, preferred delivery terms such as FOB or CIF, packing or labelling needs, and any tender reference.
Who manufactures this potentiometer?
JLab (Jain Laboratory Instruments Pvt Ltd) makes the Crompton potentiometer at its works in Ambala, Haryana, India. The Crompton name describes the classic instrument design, not another company’s brand.
OEM Manufacturer
JLab is the trading name of Jain Laboratory Instruments Pvt Ltd, an electrical and physics lab instruments manufacturer in India, incorporated in 2017 and based on Hargolal Road, Ambala, Haryana. The Crompton potentiometer is built and wired at JLab’s own works, not bought from a trader, which lets colleges, polytechnics, dealers and importers buy direct from the maker; each instrument is visually inspected before dispatch, and repeat orders and related items such as the volt ratio box come from the same source. JLab exports worldwide and ships to buyers in every region — New Zealand in Oceania, Thailand in Southeast Asia, Ukraine in Eastern Europe, the UAE in the Middle East and Botswana in Southern Africa, to name a few. For tenders, see the JLab lab tenders page.
Items Used with the Crompton Potentiometer
- Volt Ratio Box — tapped divider for extending the range of the Crompton potentiometer.
- Standard Cell — a stable voltage reference in a small steel cabinet for standardisation.
- Moving Coil Galvanometer — a centre-zero DC galvanometer on a stand for the null reading.
- Acid Accumulator — a lead-acid storage cell for the working battery circuit.
- Potentiometer Dial Pattern — the compact teaching potentiometer with dial coils and a slide wire.
Find more in the Scientific Instrument range and the Indian Instruments section.
Request a Quote
Quotes come direct from the manufacturer. Use the Add To Cart enquiry button, or send the quantity (minimum 10 units), whether you need a volt ratio box, standard cell or galvanometer with it, and the delivery location through the contact page.
Last updated: 8 October 2026
