7-3
Chapter 7. SPECIFICATIONS
Model No.
Item
MQV9020 MQV9050
Flow rate
display
Display method 7-segment LED, 4 digits
Setup resolution See “Gas type and control range” table (page 7-9).
Indication accuracy
(at standard tempera-
ture and differential
pressure;
Q: flow rate)
(1)
±1 % FS ±1 digit (50 % FS < Q ≤ 100 % FS)
(2)
±0.5 % FS ±1 digit (0 % FS ≤ Q ≤ 50 % FS)
±1 % FS ±1 digit
Totalizing
function
Display range 0.0 to 99,999,999 mL
Display resolution 1 mL
Totalized count backup
timing
(1) Every 200 mL (1) Every 500 mL
(2) Every hour from the previous backup
(3) At the time the RUN key is pressed.
Analog
output
Output type Instantaneous flow rate (PV) output or setting flow rate (SP) output
(switchable)
Output scale 0 to full-scale flow rate (scale can be changed)
Output range 0 to 5 V DC/1 to 5 V DC/0 to 20 mA/4 to 20 mA (switchable)
Max. output 7 V DC max./28 mA max. (max. output when flow rate exceeds the range)
Accuracy Total output accuracy ±0.3% FS Indication accuracy ±0.3 % FS
External resistance Voltage output type: 250 kΩ min. Current output type: 300 Ω max.
Alarm/
event
output
Number of outputs Alarm output: 1, Event output: 2
Output rating 30 V DC, 30 mA max. (open collector non-insulated output)
Totalized pulse output width
100 ms ±10 % (when pulse output is selected in the function setup)
Totalized pulse output rate
1 mL /1 pulse
External
switching
input
Input type, number of
inputs
External 3-way switching input (OPEN/0 V/5 V): 1
External contact input (2-way switching): 3
Required circuit type Non-voltage contact, or open collector
Contact OFF terminal
voltage
External 3-way switching input: 2.5 ±0.5 V
External contact input: 2.8 ±0.5 V
Contact ON terminal
current
Approx. 0.5 mA (current flowing to contact)
Allowable ON contact
resistance
250 Ω max.
Allowable OFF contact
resistance
100 kΩ min.
Allowable ON residual
voltage
1.0 V max. (open collector type)
Allowable OFF leakage
current
50 μA max. (open collector type)
Reference
voltage
output
Output rating 5.0 V DC ±5 %, 5 mA max.
Application Reference voltage of flow rate setting voltage and 5V input of
external 3-way switching input
Commu-
nications
Mode (1) MLP loader communications *
5
(2) RS-485 communications (3-wire system) *
6
Transmission speed 2400, 4800, 9600, 19200, 38400 bps
(only 19200 bps for loader communications )
Power Rating 24 V DC, current consumption: 300 mA max.
Allowable power voltage range
21.6 to 26.4 V (ripple 5 % max.)
Isolation The power circuit is isolated from the input/output circuit.
Material of gas-contacting parts SUS316, fluororesin, Fluororubber
Connection method 1/4" Swagelok, 1/4" VCR
Mounting orientation Horizontal. Be sure that display surface does not face down.
Mass Approx. 1.2 kg
Applicable standards EN61326-2-3, EN61326-1
(To be used in an industrial electromagnetic environment)
During EMC testing, the reading or output may fluctuate by the
equivalent of ±10%FS.
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