45 BEE Model 7614 Shaft Speed Monitor
46 Watchdog Model AG3 Shaft Speed Monitor
47 Roto-Sens 4RS Model 477 Shaft Speed Monitor
Summary of BEE Model 7614 Shaft Speed Monitor (Evaluation Report - PDF File - 0.37 MB)
The BEE Model 7614 shaft speed monitor was suitable for monitoring both slow and high speed shafts on agricultural machines and for signalling the operator that machine components had stopped or were operating at too slow a speed. The model 7614D slow speed detector package was suitable for monitoring slow speed components such as grain drill seed metering shafts while the model 7614C high speed detector package was suitable for monitoring high speed shafts such as on combine straw choppers.
The control box channel lights were bright enough to signal the operator providing the control panel was not in direct sunlight. The audible channel alarm was loud enough to be clearly heard above tractor or combine noise.
By selection of suitable detectors and pickups, the BEE shaft speed indicator could be successfully used for any shaft speed below 3600 rpm. System sensitivity was adequate for all applications. It was found most suitable to adjust sensitivity to cause the operator alarm to be triggered with a 20% drop in component speed. Response time was about 60 seconds for slowly turning shafts and was virtually instantaneous for high speed shafts. Response time was adequate for all applications.
The monitoring system could be installed in about five hours on a multiple grain drill hookup and could be installed in about four hours on a self-propelled combine. Alignment of high speed detectors was difficult due to a limited range of adjustment in the detectors and mounting brackets.
The operator's manual clearly outlined installation, operation and adjustment of the monitor.
Summary of Watchdog Model AG3 Shaft Speed Monitor (Evaluation Report - PDF File - 0.44 MB)
The Watchdog Model AG3 shaft speed monitor was suitable for monitoring both slow and high speed shafts on agricultural machines and for signalling the operator that machine components had stopped or were operating at too slow a speed. The detectors were capable of monitoring slow speed components such as grain drill seed metering shafts and high speed shafts such as on combine straw choppers.
The control box channel lights were bright enough to signal the operator providing the control panel was not in direct sunlight. The audible alarm was loud enough to be clearly heard above tractor or combine noise.
Five channels could be successfully used for shaft speeds below 2200 rpm while the sixth channel was suited for shaft speeds above 3500 rpm. System sensitivity was adequate for all applications and was largely dependent upon fine adjustment of the speed dials. It was found most suitable to adjust sensitivity to cause the operator alarm to be triggered with a 20% drop in component speed. Response time was about 10 seconds for slowly turning shafts and was virtually instantaneous for high speed shafts. Response time was adequate for all applications.
The monitoring system could be installed in about five hours on a multiple grain drill hookup and could be installed in about four hours on a self-propelled combine. Alignment of the detectors was difficult due to the limited range of adjustment in the mounting brackets. The bar magnets were too long for mounting on the seed metering shafts of several common drills.
The operator's manual was brief and poorly illustrated. It was vague regarding identification of components and relative positioning of detectors and magnets.
Summary of Roto-Sens 4RS Model 477 Shaft Speed Monitor (Evaluation Report - PDF File - 0.27 MB)
The Roto-Sens 4RS Model 477 shaft speed monitor was suitable for monitoring both slow and high speed shafts on agricultural machines and for signalling the operator that machine components had stopped or were operating below the desired speed. It was suitable for monitoring slow speed components such as grain drill seed metering shafts and high speed components, such as combine straw chopper shafts.
The control box lights were bright enough to signal the operator providing the control panel was not in direct sunlight. The channel alarm buzzer could be adjusted to be clearly heard above tractor or combine noise.
The Roto-Sens 4RS could be successfully used for any shaft speed below 4000 rpm. System sensitivity was adequate for all applications and was somewhat dependent upon the operator's skill at adjusting the dials. It was found most suitable to adjust the sensitivity to cause the operator alarm to be triggered with a 20% drop in component speed. Response time was adequate for all applications.
The monitoring system could be installed in about 3.5 hours on a pull-type combine. Alignment of the detectors was fairly easy due to the large detector faces and the long adjustable brackets.
The operator's manual clearly outlined installation, operation and adjustment of the monitor. |