Spirax Sarco Spirax Sarco M850-W-x and M850-P-x Flow Computers

The Spirax Sarco Spirax Sarco M850-W-x and M850-P-x flow computers are flexible and easy to use flow computers that accurately calculate mass flow and energy for steam, gases and liquids in a wide range of applications. The standard products are fully compliant with European directives, can carry markings on request, and can be supplied with manufacturer's typicality test certificates, uncertainty certificates/inspection reports (to be specified when placing an order).

Available options

• M850-P: Panel type, driven by 24 Vdc.
• M850-W: Wall-mounted for 100/240Vac drives.
• Analog Output Selection: Each option can be selected without 4-20mA analog output, with one 4-20mA analog output, or with two 4-20mA analog outputs. Instrument versions are indicated as M850 -X, where X stands for -P (panel mount) or -W (wall mount), followed by -0 (without analog output), -1 (with one analog output), -2 (with two analog outputs).

User interface (front panel)

Display mode	LCD film color, 3.5", LED backlighting
Display size/resolution	43.8 mm x 77.4 mm / 272 (RGB) x 480 px
LED Indicator Keypad	3 two-color LCD lights (red/green, alarm, REC, USB indicator)
Number of buttons	19
Input Organization	6 x I (0 / 4 - 20 mA): WE1, WE2, WE3, WE4, WE5, WE6; 3 x RTD (4 - wire): WE7, WE8, WE9; 3 x I / PULS: WE10, WE11, WE12
Signal form	0 - 20 mA or 4 - 20 mA
Transmitter Connections	2-wire passive transmitter (fed by M850) or active transmitter (current source transmitter)
input resistance	95 Ω ± 10% (protected by series PTC 50mA fuse)
Transmitter Power Supply	24V DC + 10%/-20% up to 22mA per channel (protected by series PTC 50mA fuses and resistors)
A/C converter resolution	18-bit (24-bit σ - δ analog to digital converter)
50 Hz / 60 Hz filter	Sinc3 Digital Filter
Damping (first-order low-pass filter time constant)	2s/5s/10s/20s/30s/1min/2min/3min/5min > 0.01% Full Scale
Measurement resolution	-
Accuracy (T amb = +25 ° C / +77 ° F)	± 0.1% full scale (typical resistance is 0.05% of full scale)
temperature shift	Maximum ± 0.02%/°C at full scale
Maximum Input Voltage	± 40V DC voltage None; all inputs grounded
Input Current Isolation	-
Analog output current isolated RS-485/422, Ethernet	250 V continuous AC; 1500 V AC/1 minute
RTD form (3 analog inputs for temperature sensors)	Pt - 100 x K; Ni - 100 x K; here K = 1...11 (K - multiplier, e.g. for Pt - 200, K = 2)
Sensor form	-
Measurement range	Pt100 x K : -200 ... +850 Ni100 x K : -60 ... +150 ° C / -328 ... +1562 ° F ° C / -76 ... 302 ° F
sensor interface	4-wire (2-wire with bridge)
Wire resistance compensation	Automatic compensation, or additional -99.99 ... +99.99 Ω manually operated compensation
Maximum resistance of wire connection	50 Ω
A/C converter resolution	18-bit (24-bit σ - δ analog to digital converter)
50 Hz / 60 Hz filter	Sinc3 Digital Filter
Damping (first-order low-pass filter time constant)	2 s / 5 s / 10 s / 20 s / 30 s / 1 min / 2 min / 3 min / 5min
Measurement resolution	> 0.051 TP3T reading or 0.1 Ω (TBV)
Accuracy ( T amb = +25 ° C / +77 ° F)	± 0.5 °C / ± 0.9 °F (typical ± 0.3 °C / ± 0.54 °F)
temperature drift	Maximum ± 0.02 °C / ° C / 0.036 ° F / ° F
Maximum Input Voltage	DC ± 40 Vdc
Input Current Isolation	None; all inputs grounded
Analog output current isolated RS-485/422, Ethernet	250 V continuous AC; 1500 V AC/1 minute

PULS form (binary/pulse/frequency)

Measurement range	0 ... 20kHz (f<0.001Hz cutoff) (with 0 ... 1kHz filter jumper J1/J2/J3 (on))
Minimum pulse width	25 μ s (with 0 ... 1 kHz filter jumper J1/J2/J3 (on))
Frequency measurement accuracy (at T amb = +25 ° C / +77 ° F)	0.02%
Maximum Input Voltage	DC voltage ± 40 V
Current isolation between inputs	None; all inputs grounded
Analog Output Current Isolated, RS-485/422, Ethernet	250 V continuous AC; 1500 V AC/1 minute
Configuration ( default ) : OC or Contact On/Off	( Internal jumper J4 / J5 / J6 ON)
open circuit voltage	5 Vdc
short-circuit current	5 mA
On/Off Limit Value	2.7 V / 2.4 V
Configuration: Voltage input	( Internal jumper J4 / J5 / J6 OFF)
signal amplitude	4 ... 36 Vdc
On/Off Limit Value	2.7 V / 2.4 V
input resistance	≥10 k Ω
Flow, thermal compensation devices	-
Calculation of update rate	1 s
Steam, water, other fluids or process fluid compensation device accuracy	Typical: better to ± 0.5% (worse condition: better to ± 2%)

4 - 20mA analog output (optional)

Number of outputs	1 or 2
output signal	Passive 4 - 20mA (external loop current required)
resolution (of a photo)	16-bit DAC
U ∞ = 24V Resistance (RL) Range	0 ... 600 Ω
Minimum circuit supply voltage	U CCmin = RL x 0.022 + 8
Maximum circuit supply voltage	DC voltage 28V
Accuracy ( T amb = +25 ° C / +77 ° F)	Better than full scale ± 0.2%/°C
temperature drift	Maximum ± 0.02%/°C at full scale
Analog output current isolated RS-485/422, Ethernet	2250 V continuous AC; 1500 V AC/1 minute

Binary Output (M850 - W - x)

Number of outputs	4
output form	3 Electrodes (COM,NO,NC) Electromechanical Relay
Contact rating (resistive loads)	AC voltage 85 ... 250V/ DC voltage 30V, 3A
Maximum Conversion Voltage	AC voltage 250V/ DC voltage 125V
Maximum conversion power	750 VA / 90 W

Binary Output (M850 - P - x)

Number of outputs	4
output form	2-Electrode Solid State Relay
Contact rating (resistive loads)	AC/DC voltage 60V, 0.1A
Maximum open circuit resistance	20 Ω

RS-485 / 422

variation agreement	ASCII Modbus RTU
Number of network nodes	256
Maximum line length	1200m (depending on data cable quality and transmission rate)
transmission rate	1.2, 2.4, 4.8, 9.6, 19.2, 38.4, 57.6, 115.2 kbps
parity control	Even, odd, none e
framework	1 start byte, 8 data bytes, 1 parity byte, 1 stop byte
Internal Terminal Resistance	Yes, DIP conversion activation
Maximum total line voltage	-9 V ... +14 V
Driver Differential Output Minimum Voltage	1.5 V (R L = 54 Ω)
Minimum receiver sensitivity	200 mV
Short circuit / thermal protection	there are
Current Isolated Analog Output, RS-485/422, Ethernet	250 V continuous AC; 1500 V AC/1 minute

Ethernet port

variation agreement	Modbus TCP, ICMP(ping), DHCP server, http server.
interfaces	Ethernet 10BaseT
data buffer	300 B
Number of open connections (simultaneous)	4
Connection form	RJ - 45
LED indication	2 (on RJ-45 jack)

USB port

Socket form	Form A, based on the USB standard
releases	USB 2.0
Forms of recording	FAT 16 (to a limited extent)

Power supply (M850 - W - x)

rated voltage	AC 100 - 240V; 50/60Hz
voltage range	AC 85 ... 264V; 47 ... 63Hz
power supply (of an appliance etc)	Maximum 20VA

Power supply (M850 - P - x)

rated voltage	DC 24V
voltage range	DC 18 ... 36V
power supply (of an appliance etc)	Maximum 8W

Terminal block (M850 - W - x)

Cable Splices/Terminals	Spring-loaded terminal blocks
Conductor cross-section	Single wire 0.2 ... 2.5 mm² Multi-stranded wire 0.2 ... 1.5 mm² Multi-stranded wire with metal ring 0.25 ... 1.5 mm² AWG 26 ... 12
cable gland	4 in the form of air seals M20, 2 in the form of air seals M16

Terminal block (M850 - P - x)

Cable Splices/Terminals	Screw Terminal Block, Plug Type
Conductor cross-section	Single wire max. 1.5 mm² max Multi-stranded wire max. 1 mm² max Multi-stranded wire with metal ring 0.25 ... 1.5 mm², AWG 30 / 14

weights

Available types	Weight (kg, estimated)
M850-W-x (wall-mounted)	2.00
M850-P-x (panelized)	0.75

Housing (M850 - W - x)

Enclosure form	Wall Mount, Polycarbonate
protection class	IP65

Housing (M850 - P - x)

Enclosure form	Panelized, Polycarbonate Resin 920 Material
protection class	IP65 / IP20

environmental conditions

environmental temperature	0 ... +55 °C (32 ... 131 °F)
relative humidity	5 ... 95% (non-condensing)
high degree	Altitude ≤2000m (6562 inches)
Storage temperature	-30 ... +70 °C
Overvoltage category	III
contamination level	3 (panelized, wall-mounted, mounted in enclosure)
LVD (security)	Electrical Safety EN 61010 - 1:2010
EMC	Exemption from EN 61326 - 1:2006, Table 2 EN 55011 and EN 55022, class B for immunity to radiation and electrical interference.

Security information, installation and maintenance

See the Installation and Maintenance Guide supplied with the shipment for detailed information. The wall-mounted M850-W-x requires three fixing screws (not supplied) to mount it to a wall or DIN rail; the panel-mounted M850-P-x is supplied with fixing hooks. An adapter version is available as a separate kit to replace an existing M200 or M800 flow computer with the M850. This product is recyclable and, if disposed of properly, is not harmful to the environment when disposed of.

How to Order

Example: 1-M850-W-1 wall-mounted flow computer, 4-20mA output, 240Vac.

How to order

The M850 flow computer is available without spare parts and is supplied with an accessory-panel adapter.