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Portable device for periodic measurement of the volume fraction of oxygen in various gases (hydrogen, natural gas, nitrogen, argon, helium, etc.). Mainly used for monitoring oxygen in the cooling circuit of generators, electrolysis plants, gas pipelines of boilers, monitoring the air of the working area. The warranty is 24 months for deliveries across the Russian Federation. High-precision measurement of oxygen microconcentrations Unique, patent-protected sensor design Exceptional selectivity to oxygen molecules Insensitivity to humidity, carbon dioxide, oil vapor Stable operation in a gas environment of any composition Ease of operation Automatic temperature and barocompensation The duration of measurements is 2-3 minutes Atmospheric air calibration Routine maintenance - no more than 1 time per year Built-in flow stimulator for forced sample delivery High contrast LED indicator IP54 housing case Protection from dust and moisture Built-in long-lasting battery At least 1000 charge/discharge cycles Carrying strap

Frequency comparators CHK7-1011 and CHK7-1011/1 can also be used as frequency and time standards with frequency correction based on GLONASS/GPS signals as sources of highly stable signals in various frequency measuring systems. Comparators have a built-in device for processing measurement data based on a microcomputer, which provides statistical processing of the results of frequency and time measurements, and a device for displaying information based on a color TFT display. The built-in diagnostic system allows you to quickly determine the operability and condition of the main comparator devices with information output to the built-in display screen. Comparators are available in three versions and differ in composition and functions performed. Comparators have a basic set of devices (modules), including a frequency comparator, a power supply module and a device for processing and displaying information based on a microcomputer and a color TFT display. The frequency comparator CHK7-1011 has a built-in SRNS receiver and a highly stable rubidium frequency standard Ch1-1014 with the function of correcting the actual frequency value by signals from satellite radio navigation systems GLONASS or GPS. The comparator forms its own time scale with the ability to synchronize on any external time scale received by the SRNS receiver built into the device. The device has two modes for measuring the deviation of the generated time scale: from the time scale of the built-in SRNS receiver and from the external time scale. Information about the current time received from the SRNS receiver is displayed on the comparator display screen, and is also transmitted to the consumer via the RS-485 interface. All the above-mentioned features make the frequency comparator CHK7-1011 a unique measuring device in the field of frequency and time measurements. The frequency comparator CHK7-1011/1 has a highly stable rubidium frequency standard Ch1-1013 and can be used as a frequency and time standard as a source of highly stable signals in various frequency measuring systems. The frequency comparator CHK7-1011/2 does not include any additional devices. To carry out measurements with it, it is necessary to use a highly stable signal of the reference frequency from an external RF or hydrogen frequency standard. For the convenience of users, apart from the keypad, they can also exercise control of the functions of the devices with a mouse-type manipulator included in the delivery package. Comparators provide access to measurement data over an Ethernet network.

The built-in time scale shaper provides a pulse signal of 1 c at the output of the device. Its small dimensions, weight, power consumption, and operating time allow it to be widely used as an embedded source of high-stability signals in frequency measuring devices and complexes, telecommunications systems, navigation and communication systems. It includes a frequency binding module based on a pulse signal of 1 s from an external time scale or from a SRNS GLONASS/GPS receiver and a tunable frequency synthesizer with the ability to adjust the frequency via the RS-232 interface. The built-in binding module allows the device to be used when operating in automatic correction mode as a source of a highly stable signal with a frequency error of ± 5 · 10-12 per day.

Convenience and accuracy of measurement | Automatic temperature and barocompensation, air oxygen calibration. Measurement modes | KRK and temperature. IP65 | Compact sealed device is reliably protected from dust and moisture. Non-volatile electronic notebook | The ability to record up to 500 measurement groups in User-named folders. USB port, software included | The ability to create and manage a data archive on a PC. Graphic indicator with backlight | Indication of readings in a user-friendly format, ease of settings. Long-lasting sensor | Sensor service life of at least 10 years. Low power consumption | Up to 600 hours of continuous operation from a set of AA elements. Designed for "operational" monitoring | "Fast" sensor – the measurement time is no more than 3 minutes. Illumination for work in darkened rooms. Record measurements at the touch of a button. Self-diagnosis | Additional guarantee of correct operation of the device

Mathematical processing of the measurement makes it possible to determine and display on the indicator board the relative systematic change in frequency, the average relative value of the frequency difference, the RMS relative frequency deviation, the RMS relative two-sample frequency deviation.

Measurement of electrical conductivity (UEP, UEP20, UEP25), equivalent salinity according to NaCl, total salinity (TDS) and temperature of water and aqueous solutions in various industries and national economy. Control of chemical water treatment at thermal power facilities. Control of surface waters at a depth of up to 20 meters. Control of distilled water according to GOST 58144-2018 "Distilled water. Technical conditions". Control according to GOST 26423-85 "Soils. Methods for determining the specific electrical conductivity, pH and dense residue of water extract". 24-month warranty for deliveries across the Russian Federation IP65 The compact sealed device is reliably protected from dust and moisture Electronic notebook Ability to record up to 100 measurement groups in User-named folders Stainless steel Submersible sensor The ability to measure at a depth of up to 20m Graphic indicator with backlight Indication of readings in a user-friendly format Low power consumption Up to 600 hours of operation from a set of AA type elements

Since it is reliable and easy to operate, the device is widely used in metrological centers, measuring laboratories, at the workplaces of REA developers. The comparator Ch7-1014 has a communication interface with an external personal computer USB 2.0 and application software for an external PC. At the request of the customer, the comparator can be supplied complete with a laptop or tablet computer with installed software.