Gas Detection & Safety Instruments · Gas Leak Detectors
Portable combustible gas leak detector reading 3 to 20 percent of the lower explosive limit with a flexible gooseneck probe, a three-way alarm and a full-colour display.
JLY-CP100 (2 models) ·
A gas leak is found by moving a sensor through the place where the gas would collect and watching for the reading to rise, and almost everything about a portable detector follows from that. The probe has to reach where a hand cannot, the alarm has to be noticed when the person holding it is looking at a pipe rather than at a screen, and the reading has to be steady enough to tell a leak from a background.
The instrument in this range is arranged around those three requirements rather than around an accuracy figure.
Two designations of the same instrument are described, an earlier one and a later one that adds a prefix to the same number, despatched at random unless a particular one is established before the order. Their appearance and function are the same, and the difference is in the screen interface and the marking on the body. A basic battery form without a display is also offered in the material, indicating a leak rate with a lamp and alarming audibly and visually.
The measuring instrument reports a live concentration against a range and compares it to a fixed alarm point at 10 percent of the lower explosive limit. The range starts at 3 percent of that limit, which is the point that makes the instrument useful as a locator rather than only as an alarm.
The sensor sits at the tip of a flexible hose, so it can be placed at a joint, a valve or a length of pipe while the body stays in the hand and the display stays visible. Combustible gas arriving at the tip produces a response that is converted into a reading against the lower explosive limit, and the instrument compares that reading to its alarm point.
The reason the scale is expressed as a fraction of the lower explosive limit rather than as a concentration is that the fraction is comparable between gases, while the concentration at which each gas becomes hazardous is not. It also means the reading is meaningful only against the gas named on the display, because one sensor response corresponds to a different concentration of methane than of petrol vapour. The alarm point at 10 percent of the limit sits well below the point of ignition, which is the purpose of an alarm that is meant to precede a hazard rather than mark it.
The first question is whether a number is needed or only a leak rate. The basic form answers the second with a lamp and an audible alarm and no display, and it is the quicker instrument for the person whose task is to walk a run of pipe and find the joint that is passing. The display instruments answer the first, with a live reading, a curve over time and a stored record.
The second is reach and access. A flexible hose that bends and straightens is what allows a sensor to be placed inside a cabinet, behind a panel or along the underside of a pipe run, and the length of the hose is part of the instrument rather than an accessory. The third is where the instrument will be used, because the working range of minus 25 to 55 degrees Celsius and the humidity limit are stated, and the provision for a certificate of conformity is a question about a classified area that has to be answered before entry.
The material gives a range, an error and an alarm point, and it names the gases, but it does not name the sensing principle, the sensor life, or the warm-up and response times, and it does not mention a zero adjustment, a calibration gas or a calibration interval. On the material as supplied the instrument is a locator whose reading is a relative indication within a stated band, and it cannot be presented as a calibrated analyser of gas concentration until those figures are established, because a combustible gas sensor drifts and ages and its reading is only as good as the adjustment behind it.
There is a second consideration in the way the instrument is used. A leak is found by moving the sensor slowly, because the gas has to reach the element, and a sensor swept past a joint quickly will show less than a sensor held at it. For the same reason the reading depends on where the gas has collected, which is a property of the space and not of the leak, and a joint that passes can read low in a draught. The curve display exists to make that distinction easier, by showing whether the rise is sustained as the probe is held or is a single sample that does not repeat.
Every value below is taken from source documentation. Where a parameter is not stated in the available material it is marked as information required rather than estimated.
| Detection range | 3 to 20 percent of the lower explosive limitStandard |
|---|---|
| Sub-ranges | 0 to 1000 ppm and 0 to 100 percent of the lower explosive limit, both carried as printed although the two scales are not the same physical quantityInformation required |
| Alarm set point | 10 percent of the lower explosive limit, a single fixed point that the material does not describe as adjustableStandard |
| Indication error | plus or minus 5 percent of the lower explosive limitStandard |
| Sensor principle | Not stated in the material, which describes a high-sensitivity element without naming its typeInformation required |
| Response and recovery time | Not stated in the materialInformation required |
| Warm-up time | Not stated in the material; the material refers only to a self-check at switch-onInformation required |
| Zero and calibration | Not stated in the material; there is no mention of a zero adjustment, a calibration gas or an intervalInformation required |
| Cross-sensitivity to other gases | Not stated in the materialInformation required |
| Effect of a depleted sensor | Not stated in the material, and the material gives no sensor life or replacement intervalInformation required |
| Display | A full-colour screen showing date and time, the gas name, the live concentration, a range scale, status text and the unitStandard |
|---|---|
| Status colours | Red for an alarm, green for normal and yellow for a faultStandard |
| Alarm outputs | A lamp, a vibration and a buzzer togetherStandard |
| Alarm configuration | Each of the three outputs can be switched on or off separately in the menuStandard |
| Curve display | The screen switches between a curve of the concentration over time and the numeric readingStandard |
| Data storage | Stated as a feature; the material does not give a capacity, an interval or a way of reading the records outInformation required |
| Top lamp | A lamp at the top of the body, for working in the darkStandard |
| Self-check | The instrument checks its hardware at switch-on and shows a message and a countdown if it finds a fault, with the choice to proceed or cancelStandard |
| Supply | An internal 2000 mAh cell at 3.7 V direct currentStandard |
|---|---|
| Runtime | At least 8 hours on standby on a full chargeStandard |
| Charging | Type-C, with a silicone cover over the socket, and operation from a power bank also statedStandard |
| Charging time | Not stated in the materialInformation required |
| Working temperature | minus 25 to 55 degrees CelsiusStandard |
| Working humidity | below 95 percent relative humidity, without condensationStandard |
| Language and settings | A menu for date and time, display settings, alarm outputs, a language switch and a factory resetStandard |
| Display settings | Brightness from 0 to 100 percent, a sleep timer adjustable around 2 minutes, a screen-off timer adjustable around 5 minutes and a sleep brightness around 20 percentStandard |
| Body | 161.4 x 69 x 31 mm, excluding the hoseStandard |
|---|---|
| Weight | 0.275 kg, described by the material as measured by hand and as approximateStandard |
| Case material | A high-strength engineering plastic, with a textured grip on the sides and silicone keysStandard |
| Keys | A lamp key, a left key, a menu key, a right key and a power key that also confirmsStandard |
| Supplied with | The instrument, the flexible probe fitted to the body, a storage pouch, a charger, a Type-C cable, an operation manual and an explosion-proof certificate of conformityStandard |
| Explosion-proof approval | A certificate of conformity is listed among the supplied items, without a mark, a number, a body or an editionInformation required |
| Ingress protection | Not stated in the materialInformation required |
| Model | Configuration | Key ranges | Availability |
|---|---|---|---|
| JLY-CP100 | The earlier designation of the instrument, with the same appearance and the same functions as the later one | 3 to 20 percent of the lower explosive limit; alarm at 10 percent; error plus or minus 5 percent | The material states that old and new designations are despatched at random and that the two differ slightly in the screen interface and the marking on the body |
| BT-JLY-CP100 | The later designation of the same instrument | As the earlier designation | Where a particular designation is required it has to be established before the order, since the material states the choice is not made at despatch |
| Battery version | A basic form without a display, indicating leak rate with a lamp and alarming audibly and visually without a warm-up | Not stated in the material, which gives no range for this form | The simplest form for locating a leak rather than measuring it, offered in the material alongside the two display instruments |
Certifications are only published once a certificate copy can be produced, so this section is deliberately empty rather than populated with assumed approvals. Tell us which approvals your application requires and we will confirm what is available for this instrument.
The following are required for a complete specification but are not stated in the documentation supplied to us. They are listed rather than estimated:
It is a fraction of the concentration at which the gas would ignite in air, so a reading of 10 percent LEL on methane is a tenth of the way to the concentration at which a spark would produce a flame. The scale is what makes one instrument useful on several gases, because each gas has its own lower explosive limit and the fraction is comparable between them in a way that a concentration in parts per million is not. It also means the number must always be quoted against the gas, since the same sensor response corresponds to different concentrations of different gases.
The material lists an explosion-proof certificate of conformity among the supplied items, and that is the whole of what it says. It does not name a mark, a certificate number, an issuing body or an edition, and it does not state a gas group or a temperature class. A certificate of that kind is a claim that has to be verified before the instrument is taken into a classified area, because the approval is what permits it to be there at all, and it is carried on this page as a statement the client made rather than as a verified approval.
The material presents both. The display reports a live concentration against a range, and the alarm point at 10 percent of the lower explosive limit is a threshold that is compared to it, which is a measuring function. At the same time the whole design, from the gooseneck probe to the curve display and the three-part alarm, is arranged for moving the sensor around a suspect joint until the reading rises. The two uses are the same instrument, and the difference is what the operator does with the reading.
The sensor principle and its life, since neither is stated and a sensor that has to be replaced on an interval is a different proposition from one that does not; the warm-up and response times, because they decide how the instrument is used; the cross-sensitivity to gases that are not the target; the calibration arrangement, because no zero adjustment, gas or interval is mentioned; the meaning of the certificate of conformity among the supplied items, with its mark and number; the storage capacity and the way records are read out; the charging time; and the ingress protection.
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