Ohkura RM18G (N) – Hybrid Recorder


  • Contact free feedback potentiometer and input selector
  • Easy channel identification by mark printer
  • Both trend & data logging printouts
  • Dielectrics strength of 2000v between power input and ground
  • Abundance of printout function
  • Individual scale plate
  • Wide range of power supply voltage
  • Optional ic card

Ohkura RM18G and RM18N are hybrid recorders that enable digital printing on analog trend lines or pen traces on 180mm wide chart paper. The RM18G features a panel size of 288 x 288 mm in DIN dimensions, while the RM18N(M) serves as a replacement for the monitor model recorder.


Number of inputs 1,2,3,4 pen, 6,12,24,or 30 dot point
Type of input
        DC Voltage 4mVDC min., 20VDC max
        Direct thermocouple K, T, J, E, B, S, R, G, C, N,
PR40- 20,PLII,U,L,Au-Fe
        RTD Pt100Ω,Pt50Ω,JPt100Ω,Cu10Ω (at 0°C),
Cu10Ω (at 25Ω)
        Current 4 ~ 20mA
        Conductivity 100μS/m ~ 2000mS/m
Recording width 180mm calibrated
Recording accuracy ± 0.5% max
Open input protection (option) Up scale with mV or TC input
Chart Speed 1, 2, 3 & 4 pen model; 1 ~ 3600mm/h
6, 12, 24 & 30 point model; 1 ~ 1800mm/h
Chart paper Fold chart standard, 23m long, 210mm width
Data print color Purple (Red on alarm)
Dot print interval 2.5/ 5/ 10 s/ch
Input sampling 120 msec. in pen model, 2.5/ 5/ 10 s/ch in dot point model
Cartridge pen Disposable felt pen
Print head Pen models; Wire dot 1 color ribbon cartridge,
Dot point models; 6 color ribbon cartridge
Alarm 6 Set points per channel
Alarm output (option) 2 relays drive per setting. Form-C
250VAC 3A /125VDC 0.5A /30VDC 3A max.,
Hysteresis 0.5 ± 0.2%, Setting accuracy ± 0.5%
Input impedance 10MΩ min. In mV/TC input. 200kΩ min.
In mV/TC Input with burn-out, 1MΩ min.
In Volt Input and 100Ω min. In mA Input
Source impedance 10kΩ max. in mV/TC input, 200Ω
max. in mV/TC Input with burn-out, 1kΩ
max. In Volt input and 10Ω max. per wire in RTD input.
CMRR 140dB min. in 50/60 ± 0.5Hz
NMRR 60dB min. in 50/60 ± 0.5Hz
Isolation resistance Input/ground 500VDC, 20MΩ min
Dielectric strength Power supply voltage/ ground 2000VAC,
1 minute duration. input/ground 500VAC, 1 minute
Power supply voltage 85 ~ 264VAC, 45 ~ 65Hz ± 5%
Allowable instant power failure 50ms max
Power consumption 70VA max
Vibration resistance 1m/s2 max., 10 ~ 60Hz
Shock resistance 2m/s2 max
Operating conditions -5 ~ 50°C. 35 ~ 85%RH
Dimensions RM18G; 288 x 288 x 340 mm.
RM18N; 288(w) x 322(h) x 340(d) mm
Case structure Dust-proof
Mounting Panel-mount
Allowable backward inclination : 30°
Material Case — Steel plate
Door frame — Aluminum die casting
Color Case — Metallic silver
Door frame — Black(Standard)
Alarm types 6 types/ channel (H,HH,L,LL,RH,RL)
Drives 2 relay drive/alarm set value
Alarm output 250 V AC, 3 A max. (resistance load)
125 V DC, 0.5 A max.(resistance load)
30 V DC, 3 A max.(resistance load)
Hysteresis width 0.5 ± 0.2 %
Setting accuracy ± 0.5 %


Ohkura RM18G (N) – Hybrid Recorder-DpstarGroup