Product Specification Sheet
Model: MS2908
MS2900Chassis-Mount Frequency/Analog Converter with Isolated Dual Output

DESCRIPTION
The MS2908 is a chassis-mount frequency to analog converter
that converts pulse train signals from flow sensors and the like
into mutually isolated dual channel DC analog output signals.
▽ A multi-slot chassis provides ease of maintenance andhigh-density mounting.
▽ Input, output 1, output 2, and power circuits are allisolated from each other.
▽ Equipped with a fuse on the DC power line asstandard.

ORDERING INFORMATION
Ordering CodeMS2908-1□□ (□–□)-8□□[1][2][3]

SPECIFICATIONSPOWER SECTION
Power24V DC±10%
Requirement
PowerBetter than ±0.1% of span per 10%
Sensitivity
change in supply voltage
Power Line Fuse 300mA fuse
Current
50mA max.
Consumption
INPUT SECTION
Input■ Dry contact or open collector ······ OP(Specify a code in(Pull-up: Approx. 12V, 3.3kΩ)the field [1].)■ AC voltage pulse (0.1 to 100Vp-p)······························· AP (□□□)
Specify the peak-to-peak value ofinput voltage in parentheses.
■ DC voltage pulse···················································· DP (□–□ / □)└A┘ B(Standard threshold voltage: Approx.
2.5V)
Specify an input voltage range at A.
If you require a non-standard thresholdvoltage, specify the value at B.
MeasuringSpecify a measuring frequency range
Frequency Range between 0–100Hz and 0–20kHz.
(Specify a range inthe field [2].)Input Resistance Approx. 40kΩ (voltage pulse input)
Allowable Input DC voltage input: 30V DC max.,
Voltagecontinuous.
AC voltage input: 100Vp-p AC max.,
continuous (up to ±50V with reference to0V)

Input Pulse
Width20µs min.

OUTPUT SECTION
OutputOutput 1 / Output 2 ·················· Code(Specify a code in ■ 1–5V DC / 1–5V DC ·················V1
the field [2].)■ 0–5V DC / 0–5V DC ·················V5■ 0–10V DC / 0–10V DC ··············V6■ 1–5V DC / 4–20mA DC ············· C1
Note: Combinations of two outputs are
only available as shown above.
Allowable
Voltage output: 2mA max.
Output Load
Current output: 300Ω max.
Zero Adjustment Approx. ±2% of span.
(Adjustable by front-accessible trimmer)
Span Adjustment Approx. ±2% of span.
(Adjustable by front-accessible trimmer)
PERFORMANCE
Accuracy Rating Better than ±0.1% of span (at 25°C±5°C)
Temperature
Better than ±0.2% of span per 10°C
Effectchange in ambient.
Response Time
Input Frequency 90% Response Time
100Hz
Approx. 0.8s
200Hz
Approx. 0.4s
2kHz
Approx. 0.04s
20kHzApprox. 0.004s
Isolation
Isolation between input, output 1, output
2, and power.
Insulation
100MΩ min. (@ 500V DC) between
Resistance
input, output 1, output 2, and power.
DielectricInput / [Output 1, Output 2, Power]:Strength
1500V AC for 1 minute (Cutoff current:0.5mA)
Output 1 / Output 2 / Power: 500V AC for
1 minute (Cutoff current: 0.5mA)
Surge Withstand Tested as per ANSI/IEEE C37.90.1-1989.
Capability
OperatingAmbient temperature: 0 to 55°C
Environment
Humidity: 5 to 90% RH (non-condensing)
Storage−10 to 60°C
Temperature
Rev. 1.50

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Product Specification Sheet

PHYSICAL
Installation
WiringExternal
Dimensions
WeightModel: MS2908 Chassis-Mount Frequency/Analog Converter with Isolated Dual Output

Mounted in an optional chassis (RC2900).
Wired to an optional chassis (RC2900).
W17.5 × H48 × D65 mm

MATERIAL
Housing
PC Board
Potting Agent

ABS resin (UL 94V-0)
Glass fabric, epoxy resin (FR-4: UL 94V-0)

Polyurethane

70g max.

BLOCK DIAGRAM AND CONNECTION DIAGRAM

1110986543021I/O PIN LAYOUT

Rev. 1.50

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