Overview
The 202D Field Mounting Rate Totaliser requires no external power and is designed to operate with turbine, positive displacement and paddlewheel flowmeters in applications such as irrigation systems and pipelines, and as a replacement for mechanical registers.
Battery, Loop or DC powered
The standard 202D is powered by long-life lithium batteries. Alternatively, the 202D can be loop powered via an optional 4-20mA output, or powered from a 9-28 Volts DC supply. For installation in hazardous areas a certified intrinsically safe version is available. The intrinsic safety approvals cover both the 4-20mA output and relay outputs, in addition to the input circuits.
Watertight field mounting enclosure
The 202D Rate Totaliser is housed in a rugged yet attractive IP67 (Nema 4X) rated polycarbonate enclosure which is completely watertight. This enables the instrument to be mounted directly on the flowmeter, panel mounted or wall mounted using a special universal bracket. A 2″ pipe mounting bracket is also available.
Fully user programmable
K-factor, decimal point positions, filter constants and time base are fully user programmable. Rate and Totals can also be displayed in different engineering units such as gallons per minute and barrels.
Features at a glance
- ATEX, CSAUS/C approved
- Displays Rate, Total and
- Accumulated Total
- Battery, Loop or DC powered
- Intrinsically safe version – 202Di
- Watertight to IP67 (Nema 4X)
- Wall, pipe, panel or flowmetermounting
- Fully programmable
- 4-20mA output
- High & low alarms
- CE compliant
Field proven in thousands of installations around the world
Frequency to Current conversion
The 202D loop powered Rate Totaliser makes an excellent Frequency to Current Converter particularly for low frequency inputs from positive displacement or turbine flowmeters. Because the 202D calculates the flow rate by measuring the time interval between input pulses, it is able to provide a very stable and accurate 4-20mA output for low frequency inputs.
Non-Linearity Correction
The 202D is available with 10 point non-linear correction. Separate K-factors and frequency points can be programmed to compensate for changes in K-factor with flowrates. Non-linearity correction is only recommended for applications where precise measurements are required and flowmeter calibration certificates are available. Note that this option increases the display update rate to 1 second in battery powered version.
Versions Available
Battery powered
The battery version of the 202D is designed for operation where external power sources are not available. It derives its power from two lithium battery packs which provide sufficient power for up to 5 years. Low battery power condition is signalled to the operator by a message on the LCD and battery replacement is easily carried out in the field even in hazardous areas.
4-20mA Output Loop powered
The 4-20mA output version draws its operating power from the 4-20mA loop and uses lithium batteries for back-up if the 4-20mA loop is interrupted. The instrument provides a 2-wire re-transmission of the flow rate. Both the 4mA and 20mA points are fully programmable so that the output can span across the entire range or, alternatively, across a small section of the operating range.
DC powered
The DC powered version will operate from an external power source between 9 and 28 Volts and draws no more than 4mA. This enables the 202D to be powered from AC mains adaptors and eliminates the need to run mains voltages in the field. Lithium batteries provide back-up if the DC power is interrupted.
Solid State Relay Outputs
Both the 4-20mA output version and the DC powered version are provided with two solid state relay outputs. The solid state relays provide high and low flow rate alarms or, alternatively, a pulse output and a low flow rate alarm. The outputs can sink up to 200mA and can be used to power external relays, audible alarms or counters. The outputs are internally protected against voltage spikes caused by relays and coils. Both outputs are separately isolated via opto isolators. The switching points can be programmed during the set-up mode. If programmed for a pulse output, the pulse can be selected as either unscaled (raw pulse input) or scaled. The maximum pulse frequency is 500mSec with a pulse width which is automatically set as:
1mSec if output > 50Hz
10mSec if output = 5…50Hz
100mSec if output < 5H
Specifications
General
Display
Total:
7 digit 10mm (0.4″) high LCD (continuously powered). Note: The Resettable Total is resettable from the front paneland the Accumulated Total is displayed when the ACCUM TOT key is pressed.
Rate:
4 digit 8.5mm (0.33″) high LCD (continuously powered).
K-factor Range
The pulses per unit of measure (eg. pulses/gallon)
is programmable in the range 0.000001 to 999,999.
Decimal Points
Fully programmable for Rate and Total.
Time Base: Rates can be displayed in units per second, minute,
hour or day.
Frequency Range
0.01Hz to 10kHz.
Signal Type
Switch settable for sine wave (15mV P-P minimum),
open collector, reed switch or pulse.
Interference
CE compliance
Physical
Operating Temperature
-20 to 60°C.
Enclosure
Dimensions:
98mm (3.9″) high x 152mm (6.0″) wide x 43mm(1.7″) deep.
Protection:
IP67 (Nema 4X) watertight.
Cable Entry:
By cable glands.
Materials:
Polycarbonate and ABS.
Mounting Options
Wall:
Wall mount bracket.
Pipe:
A galvanised metal bracket enables the 202D to be attached to a 2″ vertical or horizontal pipe.
Panel:
Two mounting brackets are provided and terminals are accessible on the rear of the enclosure. Note: The panel mountversion is not watertight.
Turbine Meter:
Bottom and rear mounting stems are available formounting the 202D directly on turbine flowmeters which have a 1″ NPT or BSP bos
Battery Powered Version
Battery Type:
2 x Lithium battery packs.
Battery Life:
5 year
Terminal Descriptions
Common all models Number 7 Signal Input (-) 8 Signal Input (-)
DC Power Versions Number 1 DC Power 0V 2 DC Power +9 to 28V dc
4-20mA Output Version Number 1 4-20mA (-) 2 4-20mA (+) 3 Low Alarm (-) 4 Low Alarm (+) 5 High Alarm (-) or Pulse (-) 6 High Alarm (+) or Pulse (+)
Dimensional Diagram
