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The special ultralow-power timer (UPT) allows for a portable and affordable pair of rechargeable 12V sealed lead acid (SLA or AGM) 12AH rated batteries to run for over 3 months in a typical single channel measurement and data logging setup.
The main features of the UPT are a user configurable "On" time and "Off" time with an extremely low power consumption of 0.4mA @ 24VDC. This is 10 to 20 times lower than most commercially available pull timers. The wide range of programmable "On" times from 30 seconds to 300 seconds (5 minutes) and "Off" times from 4 minutes to 120 minutes allows for a very wide range of desired intermittent sampling frequencies to be supported by the UPT module.
The TT-MA(D) transmitter equipped with a TT-MA-DAT field MODBUS data logger module which can be powered on & off at will for the seamless recording of data with intermittent power operation.
The boot time for TT-MA(D) modules is only one second allowing for a near instantaneous power up and power down, minimizing power consumption for this type of intermittent use. There is a 15-second programmable delay from boot on the TT-MA-MODBUS datalogger to ignore any non-representative pH and temperature values while the time averaging scheme come to the final equilibrium value. The default time averaging period is 10 seconds but is changeable upon request.
In addition, for the duration of time that the units are energized the power consumption for each TT-MA(D) module is only slightly greater than 1 watt. This is extremely low power consumption for a field transmitter interfacing a heavy-duty industrial grade sensor. In contrast, other transmitters capable of interfacing industrial grade sensors typically have power consumptions of 12 watts or more and with a boot time of anywhere between 10 to 60 seconds both of which make them unsuitable for this type of intermittent remote battery-powered use.
RUNTIME OF 24VDC POWER FROM 2 EACH 12AH RATED 12V BATTERIES
*Single Channel Remote pH & Temperature Measurement & Datalogging System
|SAMPLING CONFIGURATION||UPT "OFF" TIME||UPT "ON" TIME||PH TEMP DATA SETS PER HOUR||MAXIMUM DAYS RUNTIME|
|Continuous||Not Used||Not Used||360||4|
|Max Sampling||4 Minutes (Min)||30 seconds (Min)||26||35|
|High Sampling||7.5 minutes||30 seconds (Min)||16||56|
|High Sampling||15 minutes||60 seconds||20||56|
|Low Sampling||15 minutes||30 seconds (Min)||8||108|
|Low Sampling||30 minutes||60 seconds||10||108|
|Max Longevity||120 minutes (Max)||30 seconds (Min)||0.5||487|
TECHNICAL SPECIFICATIONS FOR UPT PROGRAMMABLE PULL TIMER
|Mechanical & Dimensional||Electrical & Function|
|Mounting||35mm DIN-RAIL||Supply Voltage||24VDC|
|Terminals||Max wire cross section 1.5 mm2 |
Max torque 0.2 Nm
|Supply Current||0.4mA average|
|Temperature||Usage -20 to 40°C||Relay Type||Bistable (for super low current use)|
|Dimensions||D 44 x W 73 x H 93 mm||Relay Contact||1 each "NO" (Type A, normally open)|
|Off Time||From 4 to 120 minutes adjustable with P3 |
~280 seconds per turn (~28 second resolution)
|Max Load||1.0A @ 30VDC (Resistive)|
|On Time||From 30 to 300 seconds adjustable with P2 |
~11 seconds per turn (~1 second resolution)
|Runtime with 12AH rated lead acid battery||35 days @ 30 sec On / 4 min Off |
108 days @ 30 sec On / 15 min Off
487 days @ 30 sec On / 120 min Off
*Data based on 2 modules connected
|Time Adjustment||Accomplished using 25 turn potentiometer taken in at 256 steps (~10 steps per turn). |
Far right is min & far left is max setting
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