Verify storage tank liquid level
Within our facilities by using many digital pressure transmitter unit (Rosemount) measuring liquid level of various kinds of liquid storage tank.Liquid storage tank of liquid pressure on the surface of the transmitter unit, the latter will ma signal is sent back to the PLC (the higher the level of the tank pressure, the greater the = = surface output current is larger).In order to test the accuracy of liquid level, and sometimes have to disconnect cables, series a digital meter to measure the current.However, when we install a new operating system, if you disconnect the DP unit, PLC will detect circuit disconnection, puts system fault state.Now, using new type clamp table, we haven't this kind of question!
Shane Horn
Read the control card
We are going to H2S and LEL Detcon 4-20 mA of sensor output signal as our modular control card input.For a long time, we will read the signals to the control card has a problem, by disconnecting signal lines to connect the probe measurement mA signal are very trouble.
Emily Sernio
Fuel oil and natural gas production
We use e雷竞技appvery day of Fluke 87 and 787, and sometimes also used ScopeMeter handheld oscillographic table.Most of our application is in the gulf of Mexico oil and gas exploration and production.Sometimes, we have to interrupt the production, in order to measure transmitter 4-20 mA loop within the hazardous locations.For me, the new type pliers table 4-20 mA measurement function is life-saving tool.
Steve Johnson,
The petrochemical production and stable operation
My work area including process and environmental monitoring analyzer.These applications are using 4-20 mA loop to transmit data to the data recorder or distributed control system.The precision of the equipment and normal operation is very important to the process control and environmental compliance.I am in support o雷竞技appf petrochemical industry field service, using a Fluke 705 and 87.I use a fluke test equipment has reached for 27 years, haven't found the performance and reliability can substitute for match.
David Ellis
Current loop of a football field
My plant is one of the most advanced water treatment plants in the region, we have hundreds of analog instrument and loop 24 hours a day, 7 days a week, uninterrupted work.Because the 4-20 ma current loop has high reliability and diagnose faults of simplicity, we ask that it should be all the standard features of the instrument.In order to bring the key of the analog signal transmitted from its origin to the nearest controller, some of our current loop short as a few feet, some for as long as two football fields.In the process, we have seen from the cable damage to nearby lightning phenomena such as electric pulse.At present, we use a variety of loop isolator and converter to solve these problems, to ensure that health, current loop and reliable line operation.Which I have found a special problems involved in the field of industrial control at present small switch power supply.Many colleagues have been trying to solve the problem of produce roll down at the end of the range, but there is no clear explanation.Through troubleshooting, sometimes find small loop power supply can not provide full 20 ma, the reason is that the new increased the load or power itself down, sometimes in less than 20 ma output current state of some point reached level, at the same time the loop voltage began to decline.I u雷竞技appse Fluke DMM and DPC support all of the loop, thank you very much also Fluke support engineers for many years.
Gary Richardson,
The zoomPLCAnalog output
I recently replaced a Japanese valve actuator, the valve actuator based on Mitsubishi PLC from 0-20 ma analog output.Replace the valve is a 4-20 ma device.I u雷竞技appse multimeter, Fluke 789 process through the built-in control simulation of card of PLC analog output from 0 to 20 ma to zoom in to 4-20 ma.I visited the whole factory, with 789 is my right-hand man.
Michael Mathews
582A loop and increasing
771 pliers type table is great!4-20 mA环路贯穿于我们的全部设施之中，用于：- 流量检测(15+条环路)；- HVAC控制器(500+条环路)；- 温度传感器(25+条环路)；- 压力传感器(25+条环路)；- 差压(10+条环路)；- VFD控制(7台驱动)- 大量其他环路。771是我们诊断故障和校准工具的理想选择。
Tony Fyffe
4-20 mATo clarify
I just want to clarify that why use 4 mA current, rather than the zero current.The main reason is to improve the signal-to-noise ratio of the signal is small.There is no denying the fact that four differences between mA and 0 mA is very useful, is not only reflected in the aspect of fault diagnosis, but also in the failure of current loop failure protection level or default default value, right now you need to send the alarm signal.
Jay Henderson
Water monitoring
I am a big steel company shift electrician.For the energy into liquid steel, water is essential.Therefore, we use Rosemont flow and continuous monitoring of water and temperature thermometer, the instrument will be 4-20 mA signal is sent back to the PLC, then read on the remote HMI (human machine interface).771 pliers type table is priceless, can help us to quickly determine whether there is water, if there is a meter or damaged.And disconne雷竞技appct the connection, and then use some Fluke DMM compared to read 4-20 mA output, this method is much faster.
Jerry Evans
Promote the growth of bacteria
I am a dedicated sewage treatment plant installed a ABB drive, used to control two motors.4-20 mA控制电路监测水厂中曝气器部分的氧气含量，并且将电机加速或减速，以提供正确大小的空气，促进细菌生长。我在安装、诊断及测试应用中，只使用福禄克工具。本例中，我使用87-111 DMM配置信号。目前，我利用Fluke 143监测附近建筑的温度，以防在当前的严寒条件下结冰。我期盼能够用到最新的福禄克测试工具。
Mathew r. Magee
Reduce the equipment failure
Using雷竞技app standard Fluke 87 multimeter, I always use mA points to check the pressure sensors, temperature signal, position sensor and the current actual value of the inverter.Although our transmitter supports HART and field bus communication, we still use reliable 4-20 mA analog signals.In our factory, with hundreds of transmitter use 4-20 mA signal.Wit雷竞技apph new Fluke 771 clamp type table, we can greatly reduce the transmitter wiring short circuit or the fuse damage caused by equipment failure.It can more easily measure 4-20 mA signal.
Joseph Jurado
