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| Description
| Front End Modules | Mathematical
Functions | Input Specifications Output Specifications | Standard Functions | Physical Specifications | Price Quote
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|
User Job Display |
Comments Display data on
local readout |
| Serial I/O communications Dual, fully programmable RS-232C ports are standard with the 245. Each can be independently configured and optimized for external communications to peripherals, printers, modems, PCs, and mini/micro/mainframe computers. Formatting and protocol capabilities are user set via the front panel or I/O ports. Designed for
long-term reliability Start acquiring
data with the Model 245 today! |
Description | Front End Modules | Mathematical
Functions | Input Specifications
|
| Rugged, front
end for analog inputs DORIC’s exclusive FEMs (Front End Modules) make the 245 system more reliable, rugged, and capable of saving thousands of dollars in installation and wiring costs. Each FEM is a self-contained, 20-channel analog input module. Sensors are wired directly to the FEMs’ quick-disconnect style terminals. The FEMs can then be installed within the 245A mainframe or 245S satellite, or remote mounted up to a mile away. The FEM is built to withstand the more harsh conditions of remote mounting and capable of performing in ambient temperatures from 0°C to 70°C. For remote-mounted FEMs, a FEM I/O card is installed within the mainframe or satellite and a single, low-cost, four-wire cable is run between the FEM and the I/O card. Any combination of internally or externally mounted FEMs can be specified. Simply stated, in lieu of running pairs of expensive, noise-susceptible wires for each input, you can run a single, noise-free, low-cost cable for every 20 inputs! Alarms and limits As an alarm and limit monitoring system the 245 is unsurpassed. Its 250 user-programmable limit points are a standard feature of the system. Each of the 250 alarm limits are programmable for their trip value, + or - , and high or low trip condition. Then, up to four of the limit trip points (high, low, high-high, and low-low ) can be assigned to every input channel in the system. With alarms assigned, you can track alarm conditions as they transition into and out of limits, seeing them on the display, logging them to the printer, and logging them to the serial I/O ports. Relay contact closures for alarms To further communicate alarm conditions, the optional Model 245A-ARP1 provides a bank of 16 Form-C relays. Up to 4 of these, for total of 64 relays, can be interfaced to a single Model 245. The ARP1 is a separate, externally mounted box with screw terminals for wire-up to the relays and front-mounted red lamps to signal an alarm trip. The relays are 2A, 115VAC/28VDC types for noninductive loads. To communicate to the external ARP1 the 245 must have the optional Alarm Relay Panel I/O option card installed. Each I/O card will support 2 of the ARP1 boxes. |
| FEM MULTIPLEXER TYPE | SOLID STATE VOLTAGE CMOS | UNIVERSAL VOLTAGE REED | |
| Number of Points per FEM | 20 | 20 | |
| Voltage
Limits (any pin) without damage Input to chassis ground Point to point (3 sec.) High to low (3 sec.) |
250 VAC RMS(Point to point .5 sec.) | 250 VAC RMS | |
| CMV
Limit Input to Chassis Ground Point to Point |
- 250 VAC RMS 6.5 volts peak |
- 250 VAC RMS 200 volts peak |
|
| Offset Stability | Automatic Zero | Automatic Zero | |
| Dynamic Range | 65,000 counts | 65,000 counts | |
| Overcurrent Protection | 22.K ohms in series with each lead | 2.2K ohms in series with each lead | |
| Poles per Switch | 2 | 2 | |
| Power Consumption (type) | 1 watt | 1 watt | |
| Quick Disconnect | No | Yes | |
| FM Version Available | Pending | No | |
| Cenelec Version Available | Pending |
No |
|
| Range | |||
| 22mV, 440mV, 88mV, 2.2V | 22V | ||
| Normal Mode Rejection 50/60 Hz ± 0.1 | 76/80 dB | 76/80 dB | 66/70 dB |
| Effective
CMR 50/60 Hz ± 0.1 (1K/ohm Lo Lead Unbalance) |
126/130 dB | 126/130 dB | 116/120 dB |
| Input Impedance | >1000 M ohms | >1000 M ohms | 10 M ohms |
| Point
to Point Voltage Offset @ 25° |
<6µV | <10µV | <1mV |
| Accuracy
2: (All ±) 24 hrs. @ 25°C 90 days @ 25°C 1 year @ 25°C |
(.005%
Rdg+3 µV+1 ct.) (.02% Rdg+3µV+1 ct.) (.035% Rdg+6µV+1 ct.) |
(.005%
Rdg+5µV+1 ct.) (.02% Rdg+5µV+1 ct.) (.035% Rdg+8µV+1 ct.) |
(.01%
Rdg+500µV+1 ct.) (.03% Rdg+500µV+1 ct.) (.055% Rdg+800µV+1 ct.) |
| Span Temperature Coefficient | ±25 ppm/°C of Rdg | ±25 ppm/°C of Rdg | ±100 ppm/°C of Rdg |
| Offset
Temperature Stability (doubles every 10°C) |
3µV/°C | 3µV/°C | 500µV/°C |
| Thermocouple Reference Junction |
less than .01°/° | less than .01°/° | n/a |
| NOTES: 1.) The allowable source resistance is limited by charging time required by the input filter. Charging error is <.001% of reading for a source resistance of 2K ohms. Input impedance >10 meg/Function6. -10 + 22V range. 2.) Stated accuracy is achievable at reference condition using calibration equipment which adds no significant error. Factory calibration adds an error of ±(.05% Rdg+1µV+1 ct.) to reference accuracy. 3.) To convert error of 1 into display units of Percent (P) use: P=(1 in -4) 100%/16. 4.) Errors are for 4-wire only. For 3-wire add 2.5°C per ohm lead unbalance and .005°C per ohm lead resistance. Double offset errors. 5.) Error on ohms range is: ±(.05% Rdg±10 milliohms±1 ct.) 6.) Temperature equivalent measurements assume a platinum RTD input. 7.) As measured with a worst case of 100 ohms unbalance between any leads in a 4-wire configuration. For 3-wire configuration see note 4. |
| FEM MULTIPLEXER TYPE |
CURRENT REED |
SOLID
STATE RTD CMOS 4,5,6 |
REED
RTD REED 4,5,6 |
| # of Points per FEM | 20 | 20 | 20 |
| Voltage
Limits (any pin) without damage Input to chassis ground Point to point (3 sec.) High to low (3 sec.) |
250 VAC RMS | 250 VAC RMS | 250
VAC RMS (Point to point .5 sec) |
| CMV
Limit Input to Chassis Ground Point to Point |
- 250 VAC RMS 200 volts peak |
- 250 VAC RMS 6.5 volts peak |
- 250 VAC RMS 200 volts peak |
| Offset Stability | Automatic Zero | Automatic Zero | Automatic Zero |
| Dynamic Range | 65,000 counts | 65,000 counts | 65,000 counts |
| Overcurrent Protection | none | 2.2
K ohms in series with each lead |
2.2
K ohms in series with each lead |
| Poles per Switch | 2 | 5 | 5 |
| Power Consumption (type) | 1 watt | 1 watt | 1 watt |
| Quick Disconnect | No | Yes | Yes |
| FM Version Available | No | Pending | No |
| Cenelec Version Available | No | Pending | No |
| Normal
Mode Rejection 50/60 Hz ±0.1% |
76/80 dB | 76/80 dB | 76/80 dB |
| Effective
CMR 50/60 Hz ± 0.1% (1K/ohm Lo Lead Unbalance) |
126/130 dB | 126/130 dB7 | 126/130 dB7 |
| Input Impedance1 | 20 ohms | n/a | n/a |
| Point
to Point Voltage Offset @ 25° C |
<.5µa | .05°C | .05°C |
| Accuracy2:
(All ±) 24 hrs. @ 25°C 90 days @ 25°C 1 year @ 25°C |
(.15%+.25µa+1 ct.)3 (.17%+.25µa+1 ct.) (.185%+.4µA+1 ct.) | (.015% [Rdg+300° C] +.025°C+1ct.) (.016% [Rdg+300°C] +.025°C+1 ct.) (.018%[Rdg+300°C] +.05°C+1 ct.) | (.015% [Rdg+300°C] +.025°C+1 ct.) (.016%[Rdg+300°C] +.025°C+1 ct.) (.018%[Rdg+300°C] +.05°C+1 ct.) |
| Span Temperature Coefficient | ±50 ppm/°C of Rdg | ±5 ppm/°C of Rdg | ±5 ppm/°C of Rdg |
| Offset
Temperature Stability (doubles every 10°C) |
.025µa/°C | .025°C/°C | .025°C/°C |
| Thermocouple Reference Junction |
n/a | n/a | n/a |
| NOTES: 1.) The allowable source resistance is limited by charging time required by the input filter. Charging error is <.001% of reading for a source resistance of 2K ohms. Input impedance >10 meg/Function 6. -10 + 22V range. 2.) Stated accuracy is achievable at reference condition using calibration equipment which adds no significant error. Factory calibration adds an error of ±(.05% Rdg+1µV+1 ct.) to reference accuracy. 3.) To convert error of 1 into display units of Percent (P) use: P=(1 in -4) 100%/16. 4.) Errors are for 4-wire only. For 3-wire add 2.5°C per ohm lead unbalance and .005°C per ohm lead resistance. Double offset errors. 5.) Error on ohms range is: ±(.05% Rdg±10 milliohms±1 ct.) 6.) Temperature equivalent measurements assume a platinum RTD input. 7.) As measured with a worst case of 100 ohms unbalance between any leads in a 4-wire configuration. For 3-wire configuration see note 4. |
Description | Front End Modules | Mathematical
Functions | Input Specifications
|
Description | Front End Modules | Mathematical
Functions | Input Specifications
|
Description | Front End Modules | Mathematical
Functions | Input Specifications
|
Description | Front End Modules | Mathematical
Functions | Input Specifications
|
Description | Front End Modules | Mathematical
Functions | Input Specifications
|
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